8 files you don’t want to open

A few months ago, we warned you about fake Java updates and suggested that the best thing you could do to protect yourself was to keep all of your software updated.

One way criminals take advantage of software that isn’t updated is to craft PDF files that exploit Adobe Acrobat and Adobe Reader vulnerabilities. These files contain a JavaScript that runs when you open the file. The embedded JavaScript could contain commands to download and install malicious software (malware).

The Microsoft Malware Protection Center recently posted a list of files names commonly used for malicious purposes. They also warn that file names change so often that you need to exercise caution with all email attachments, especially those you receive from unknown sources or those you receive unexpectedly from known sources. They also encourage you to use extreme caution when accepting file transfers from known or unknown sources.

Do not open files with the following file names:

  • pdf_new[1].pdf
  • auhtjseubpazbo5[1].pdf
  • avjudtcobzimxnj2[1].pdf
  • pricelist[1].pdf
  • couple_saying_lucky[1].pdf
  • 5661f[1].pdf 7927
  • 9fbe0[1].pdf 7065
  • pdf_old[1].pdf

Get more information about the rise in the exploitation of old PDF vulnerabilities

About the Author
Eve Blakemore

Group Manager, Trustworthy Computing

Eve Blakemore is a Group Manager for Trustworthy Computing who delivers consumer guidance around the latest trends in security and privacy. Eve joined Microsoft in 1998 and has worked in corporate and field roles with Microsoft Learning, US Public Sector, Read more »

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19 comments
  1. Anonymous

    gud suff

  2. Anonymous

    i have windows security essentials but the antivirus keeos turning off  and wont turn on again,how can i sort this ,?

  3. Anonymous

    Have error code 0x8007064e on Microsoft essentials security.  Unable to get help from Microsoft.  Really want Microsoft Essentials Security active!

  4. Anonymous

    I HAVE KASPERSKY ANTI VIRUS CD BUT MY TOSHIBA SATELLIITE LAPTOP DOES NOT TAKE ITT,WHY?

  5. Anonymous

    I have lost my Microsoft secuity centre and instead have aquired " System Care Antivirus 3.7.33

    Please help as it has slowed down my PC and keeps interuping all my attempt sto down load from the microsoft website

    many thanks

  6. Anonymous

    I have been experiencing the same problem as Janet  (comment from 5/21) I will log on to my computer in the am and my security icon for virus protection is red – this happens intermittently after updates and scans – how can this be prevented or what can i do to fix/prevent this from happening

  7. Anonymous

    Where can I download a SAFE pdf reader?  

  8. Anonymous

    Am having same issue as  Janet and Lissa with the anti-virus security icon. What's up with that?

  9. Anonymous

    Same problem…Microsoft Security Essentials turns off….what's the deal and where is the fix?

  10. Anonymous

    I am having the same problem as Janet ( comment from 5/21) and Lissa (Comment 5/22) I turn on my computer and the red security badge is on. I have ran updates and scans also downloaded Microsoft security scan and ran it also.  it just appears every 3or 4 time i log on. What do I do? Why is this happening?

  11. Anonymous

    A friend got the FBI virus.  How do you remove it?  Please help.  Thank you.

  12. Anonymous

    MY COMPUTER HAS SLOWED DOWN TO ALMOST STOP AND IT WILL NOT LET ME ACCESS MY OWN FACEBOOK AND GMAIL. I AM VERY NEW TO THIS AND HAVE NO IDEA WHAT TO DO OR EVEN WHERE TO START. I REALLY NEED HELP SO I CAN USE MY COMPUTER AS I USED TO.

  13. Anonymous

    My screen opens up to only thelower half of the screen.  How do I fix this?

  14. Anonymous

    Can't the Microsoft Malware remove the 8 dangerous files before they come into the inbox? Or, let the provider know so that they can remove these files. Tell Comcast. yahoo, whoever? I don't know if this is even possible but seems it should be.

  15. Anonymous

    uninstall all programs, except core, fragment & degauss, replace OS, add new programs,,,,,, BUT most, make sure your PC is CURRENT, then enjoy,,,

  16. Anonymous

    Thanks Microsoft for your fantastic customer service as usual. So many users have highlighted problems and has anyone from Microsoft responded!!!

  17. Anonymous

    lately my laptop keeps dropping wifi connection, i reset IP address etc, im online for a few mintues and again im dropped off. i set my verizon router, off, disconnect pwr supply turn back on same problems. all other devices that are hooked up to wifi are running good

  18. Anonymous

    HOW MANY PEOPLE OUT THERE GET CONSTANTLY HIT WITH THE "AW SNAP" CUT OFF? I WOULD LIKE TO KNOW HOW TO GET RID OF IT.

  19. Anonymous

    IE9 on Win 7 takes 15 seconds to open (most of the time).  Could this we due to Microsoft Security Essentials "checking" IE9?

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