How to remove PDFdefault Adware

How to remove PDFdefault Adware

How to remove PDFdefault adware


What is PDFdefault:

Threat Classification: PUP/adware

PDFdefault (a.k.a. PDFdefault 2.0 or PDFdefault Add-on) is an adware and/or a PUP (Potentially Unwanted Products), that claims to improve users’ online browsing experience, by providing another some cool pdf features to your system, but after many review and inspections, our malware research team was not able to get any performance improvement nor speeding deference. However, they could definitely experience performance and stability issues with all the tested web browsers. Our security experts agreed with the majority of the reputable malware researchers and the classified PDFdefault is an adware and/or a Potentially Unwanted Program (PUP), mainly because it employed intrusive ad marketing and the suspicious behaviour, after PDFdefault was installed -(collects lots of private browsing data from the victim’s computer). PDFdefault is capable of system infiltration without user permission or other consent, which causes random browser redirects, browser settings modification and other potentially harmful events for user privacy. Our security specialists recommend the PDFdefault removal as it may seem a significant threat to users’ online security and identity. Many security experts and malware analysts are strongly recommending the use of the latest, award-winning anti-malware product SpyHunter 4. The distribution of such kind of malware infections has being done mainly via suspicious or questionable software bundles, hosted by suspicious and even dangerous websites around the world. These software bundles are configured to perform silent or stealth installations and keep the extra installs away from the eyes of the victim. After successful installation, the PDFdefault will change your browser settings as well as some of the system settings, making the recovery even harder. Moreover, PDFdefault starts monitoring and collecting all kinds of private data, including browsing history, web searches and their locations, account credentials, tracking cookies as well as other sensitive private information. If you think, you have PDFdefault installed on your PC, your desktop and browser windows will be filled with intrusive and annoying web ads, banners, pop-up windows or other 3rd party advertisements. If you start getting various web ads, claiming they are – By PDFdefault, Ads by PDFdefault, PDFdefault Ads, Powered By PDFdefault, Brought by PDFdefault or Brought to you by PDFdefault – you should consider your computer infected by a dangerous malware and we strongly advise you to remove the PDFdefault adware as soon as possible. PDFdefault adware works well with all known browsers like Internet Explorer, Mozilla Firefox and Google Chrome.

Usually, users that have PDFdefault adware installed on their computers might experience various intrusive and very irritating pop-up or pop-under ads, coupon boxes, banners, search suggestion windows, link advertisements or other commercials, displayed on popular web pages. The victim should consider, that the search results have being compromised as well, most likely overloaded with SPAM and other 3rd party advertising.

PDFdefault is usually bundled with some other free ad-supported software products and has being installed by default, when the user accepts the EULA, while performing an express/recommended installation of that software bundle. The possible distribution of PDFdefault varies but is not limited to – installing third-party toolbars, free software products, video editing software, codecs, downloading e-mail attachments, clicking on ads or banners etc.

The main purpose of PDFdefault is to generate as much traffic as possible to certain domains, which could easily be monetized via one of the many online marketing and/or affiliate platforms. Please note, that the creators of such or similar adware or malware would collect information that might be used to track your browsing habits, however often they collect much more than your web search history. PDFdefault may use cookies and other relevant techniques, that might be used to collect private data like account information, username, passwords, financial information including credit card and bank account numbers etc. That’s why this malware infection should not be left unattended and needs to be terminated immediately, as it is a serious threat to your private data and online security.

!!! Please note, that these infections could potentially bring up other malware to your computer and even cause a loss of data. Please, do not underestimate such threats.

How to remove PDFdefault adware:

There are two ways to remove this infection. It is totally up to you to decide which way you want to go:

1. Automatic Removal Method (recommended for ALL users) using the SpyHunter Malware Security Suite.

2. Manual Removal Method (recommended ONLY for PC Experts or Enthusiasts).

Remove PDFdefault adware Automatic:

We recommend using SpyHunter Malware Security Suite.

You can download and install SpyHunter to detect PDFdefault and remove it, by clicking the button below. Once installed, SpyHunter will automatically scan and detect all threats present on your system, but in order to use it as a removal tool, you need to purchase a subscription.

SpyHunter will automatically scan and detect all threats present on your system.

Learn more about SpyHunter (EULA). You can find SpyHunter Installation Instructions here: (LINK) SpyHunter‘s free diagnosis offers unlimited scans and detection. You can remove the detected files, processes and registry entries manually, by yourself, or purchase a subscription, which will allow you to perform an automatic removal and to receive unlimited one-on-one professional help for any malware related issue by an expert technician.

Remove PDFdefault adware Manual:

!!! Please note: You can remove PDFdefault Adware/PUP manually, however, you should proceed at your own risk, as any of the interventions might render your system inoperable. Therefore the Manual removal method is highly recommended ONLY for PC Experts or Enthusiasts. For regular users, recommends using SpyHunter.

1. Remove PDFdefault Uninstall Entry:

First, you can try to go to Control panel and click on Programs and Features (Windows Vista/7/8/10) or Add/Remove Programs (Windows XP) and check the Uninstall Programs List for any entry related to PDFdefault, CurveLayer, Interstat, USB Lock, Jollywallet,,, ProxyGate,,,,,, Search.gogetsport.comPC Backup 360, Mass Sea, Back to Back,, ChumSearch, Redirect.xmlheads.comGhostify,, Space Sound Pro, Search ManagerRelated ProgramIn Motion SearchFroovr, Martian ArcadeGamesFlightDNS UnlockerMPC CleanerHohosearch.comYeabests.ccS.hnisdlmm.comSearchguide.level3.comAds by HostifyAds by AlbireoAds by,,, Searchme.comShopperz, Sonic Train, BrowseAir, Bestadblocker, CheDotGame.comMagical Find, High Stair, Coupon Time, CutThePrice,,, iReview,, Facts Right, YoutubeAdBlocker, 1ClickDownload, Space Sound Pro,, SafeSaver, BrowseAir, BetterSurf, PassShow, Feven Pro, Price FountainCouponpeak or any third-party add-ons, extensions and toolbars, nevertheless We recommend you to look for any suspicious programs, installed on the same date, when your PC got malware infected or within the same week after that! If you find such, right-click on it and try to uninstall it. Although, please mind that these are real infections and you might not be able to remove them directly from the list.

*(Start -> Control Panel -> Programs and Features or Add/Remove Programs) or “Win + R” keys to open “Run” and type in “control”, then hit enter.

2. Remove PDFdefault from your browser:

Internet Explorer:

Go to Tools -> Internet options -> Advanced Tab and click the Reset button (make sure to select the Delete Personal Settings checkbox).

*please note that in order to save your favorites, you need to export them before resetting the browser as you will lose all personal settings.

After Internet Explorer completes the operation, click the close button and then close IE in order for the changes to take effect.

Google Chrome:

Go to the following path (you can copy-paste it) and delete the entire folder “Chrome” with all the folders and files that are in it.

For Windows XP: %USERPROFILE%\Local Settings\Application Data\Google\

For Windows Vista/7/8/10: %USERPROFILE%\AppData\Local\Google\

Alternatively, you can navigate to these folders by following these steps:

For Windows XP:

1. Click on “Start” in the bottom-left part of the screen.

2. Choose “Run“.

3. Type %USERPROFILE%\Local Settings\Application Data\Google\ and hit Enter.

For Windows Vista/7/8/10:

1. Click on the Windows logo in the bottom-left part of the screen.

2. Type %USERPROFILE%\AppData\Local\Google\ and hit Enter.

Mozilla Firefox:

1. At the top of the Firefox window (top-right corner), click the Firefox Menu button, go over to the Help sub-menu and select Troubleshooting Information.

2. Click the Refresh / Reset Firefox button in the upper-right corner of the Troubleshooting Information page.

3. To continue, click Refresh / Reset Firefox in the confirmation window that opens.

4. Firefox will close and be reset. When it’s done, a window will list the information that has being imported. Click Finish and Firefox will reopen.

3. Remove any folders or files related to PDFdefault by checking the following locations:





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