Those who create virus and other dangerous malware programs to attack your PC are always trying to stay one step ahead of anti-virus programs and public knowledge of known threats. One new mechanism of attack is not garnering enough attention but is certainly on the rise. Infected PDF attachments have been blanketing the internet recently. These are generally email messages with an infected PDF attachment trying to lure someone into opening the attachment. It can do no harm to your PC unless opened.
We have grown accustomed to safe and unsafe attachments and PDF has generally been deemed safe. The message portion of the emails is sophisticated and usually looks legitimate, from an internet service provider, bank or friend. Sometimes the address is spoofed as well. Visit the link to the Adobe Update site below for more assistance:
http://www.adobe.com/downloads/updates/
How can you stop or block the threats? Always use caution when opening an attachment. Make sure it is from a known source and information you requested or are expecting. Also make sure you have current, up-to-date virus scanning software installed and running. It is also worth keeping your Adobe Acrobat program (reader and pro) updated