The genuine AcroIEFavClient.dll file is a software component of Adobe PDF Toolbar for Internet Explorer by Adobe Systems.
An add-on for Internet Explorer, the Adobe PDF Toolbar gives you the ability to view PDF documents in your browser, as well as create PDF documents from an existing web page or email. It allows you to convert the entire page, or convert based on a selection. Additionally, you can create a PDF off of an existing link on the webpage selected. Adobe Systems Incorporated is based in San Jose, CA and provides a multitude of creative multimedia and software products. Founded in 1982, Adobe currently has offices all over the world.
AcroIEFavClient stands for Acrobat Internet Explorer Favorite Client
AcroIEFavClient.dll is a browser extension for Internet Explorer. This add-on enables several additional functions for Internet Explorer. You can disable it through the Extras menu (key combination Alt + X) under Manage Add-ons. The following paragraph provides more information about Adobe PDF Toolbar.
The process known as Adobe PDF Toolbar for Internet Explorer or Adobe IE plugin or Adobe Acrobat (version 6.0 Professional, 6.0 Standard, 6.0.1 Professional, 6.0.1 Standard, 6.0 Professional - English, Français, Deutsch, 6.0.1 Professional - English, Français, Deutsch, 6.0 Standard - English, Français, Deutsch, 9 Standard - English, Français, Deutsch, 7.0 Professional, 9 Pro Extended - English, Français, Deutsch) or Adobe Acrobat XI Pro
belongs to software Adobe PDF Toolbar for IE or Adobe Acrobat (version 8 Professional, 9 Pro Extended, 9 Professional, 9 Standard) or Adobe Common File Installer or Adobe IE plugin or Adobe Creative Suite (version 2) or Adobe Photoshop (version CS6, CS2) or Adobe Premiere Elements (version 10 HD) or IPrint
by Adobe Systems (www.adobe.com).
Description: AcroIEFavClient.dll is not essential for the Windows OS and causes relatively few problems. AcroIEFavClient.dll is located in a subfolder of "C:\Program Files"—mostly C:\Program Files\Adobe\Acrobat 6.0\Acrobat\ or C:\Program Files\Adobe\Acrobat 7.0\Acrobat\.
Known file sizes on Windows 10/8/7/XP are 147,456 bytes (55% of all occurrences), 225,280 bytes and 5 more variants.
This .dll file is a Browser Helper Object (BHO) that runs automatically every time you start your web browser. BHOs are not stopped by personal firewalls, because they are identified by the firewall as part of the browser itself. BHOs are often used by adware and spyware. IDs used by this BHO include AE7CD045-E861-484f-8273-0445EE161910 or F4971EE7-DAA0-4053-9964-665D8EE6A077. The program is not visible. AcroIEFavClient.dll is able to change the behavior of, or monitor Internet Explorer. The service has no detailed description. AcroIEFavClient.dll is not a Windows system file. You can uninstall this program in the Control Panel. The program has no file description. Therefore the technical security rating is 59% dangerous; however you should also read the user reviews.
Recommended: Identify AcroIEFavClient.dll related errors
If AcroIEFavClient.dll is located in a subfolder of "C:\Program Files\Common Files", the security rating is 52% dangerous. The file size is 141,192 bytes (28% of all occurrences), 343,424 bytes and 15 more variants. The program is not visible. The AcroIEFavClient.dll file is able to monitor web browsers. It is digitally signed. The AcroIEFavClient.dll file is not a Windows system file. There is no detailed description of this service.
If AcroIEFavClient.dll is located in a subfolder of the user's profile folder, the security rating is 57% dangerous. The file size is 141,192 bytes (33% of all occurrences), 343,424 bytes or 231,160 bytes. The program is not visible. The AcroIEFavClient.dll file is able to change the behavior of, or monitor Internet Explorer. AcroIEFavClient.dll is certified by a trustworthy company. The service has no detailed description. It is not a Windows core file.
If AcroIEFavClient.dll is located in a subfolder of the user's "Documents" folder, the security rating is 84% dangerous. The file size is 147,456 bytes.
External information from Tony Klein:
Important: Some malware camouflages itself as AcroIEFavClient.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the AcroIEFavClient.dll process on your PC to see if it is a threat. If Adobe PDF Toolbar has changed your browser's search engine and start page, you can recover your browser's default settings as follows:Reset default browser settings for Internet-Explorer ▾
The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active AcroIEFavClient process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the AcroIEFavClient.dll on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.
A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.
Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.