How to remove the BN1 virus

Most antivirus programs identify BN1.tmp as malware—for instance Microsoft identifies it as TrojanProxy:Win32/Treizt.A or TrojanDropper:Win32/Cutwail.AL, and Avast identifies it as Win32:Malware-gen.

The BN1.tmp file is a software component of Adobe Reader by Adobe Systems.
BN1.tmp is a temporary file that belongs to Adobe Reader, a freeware tool developed by Adobe to view, print and share files in Adobe's proprietary PDF format. This is not a critical Windows component and should be removed if known to cause problems. Adobe Reader (originally called Acrobat Reader) was one of the first programs developed to read files written in the PDF format. The software was made available free of charge on the release of version 2.0. The current version features editing tools, highlighting options, footnotes, accessibility options, multiple screen modes and support for touch screens. Adobe Systems Incorporated is an American software giant that develops software products for web design, video editing, web hosting, image editing, servers, as well as formats such as Flash and PDF. The company was established in 1982 by Charles Geschke and John Warnockin and is currently headquartered in San Jose, California.

Bn1 stands for Temporary Binary (1) File

The free file information forum can help you find out how to remove it. If you have additional information about this file, please leave a comment or a suggestion for other users.

Click to Run a Free Virus Scan for the BN1.tmp malware

BN1.tmp file information

The process known as Adobe Reader (version 8.1) or wyfmkcxh appears to belong to software Adobe Reader or ckztjnwm by gyqkimgl or Adobe Systems (

Description: BN1.tmp is not essential for Windows and will often cause problems. BN1.tmp is located in a subfolder of C:\Windows. Known file sizes on Windows 10/8/7/XP are 120,320 bytes (33% of all occurrences), 9,216 bytes or 24,576 bytes. 
There is no description of the program. It is located in the Windows folder, but it is not a Windows core file. The program is not visible. The BN1.tmp file is not a Windows core file. BN1.tmp is able to manipulate other programs. Therefore the technical security rating is 72% dangerous.

Recommended: Identify BN1.tmp related errors

If BN1.tmp is located in a subfolder of the user's profile folder, the security rating is 74% dangerous. The file size is 91,648 bytes. The software has no file description. The program is not visible. The process uses ports to connect to or from a LAN or the Internet. It is not a Windows system file.

Important: You should check the BN1.tmp process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

There are no user opinions yet. Why not be the first to write a short comment?

Do you have additional information? Help other users!
What do you know about BN1.tmp:
How would you rate it:
Link for more info:
Your Name:

Best practices for resolving BN1 issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active BN1 process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the BN1.tmp 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.

Other processes

BN1.tmp [all]