Nearly everyone working on the web uses PDF files from time to time. If you use Adobe Acrobat or Adobe Reader to view those PDF files, be warned that Adobe yesterday issued a security bulletin about a critical vulnerability affecting its software.
A buffer overflow exploit has been discovered that could render your computer vulnerable to attack; a malicious party could potentially use the exploit to take control of your machine. All versions of Acrobat and Reader from 7 onwards on all platforms are vulnerable to attack. Patches to these products will not be available until March 11th. Until Adobe issue an update, it may be advisable to switch to an alternative PDF reader (Foxit works well for Windows), and, as always, it would be a good idea to make sure that your antivirus software is up-to-date and exercise extreme caution when opening files from untrusted sources.