Adobe Reader x Vulnerability.

You’ll need to take the usual precautions. Don’t open a pdf, or any other file for that matter, that’s sent to you unless you trust the source and you are sure that the person sending it is who they claim to be.

You can read more about this specific threat here: http://nakedsecurity.sophos.com/2012/11/08/adobe-reader-zero-day-exploit-thwarts-sandboxing/