From PC World (Feb 14, 2013)...

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A recently found exploit that bypasses the sandbox anti-exploitation protection in Adobe Reader 10 and 11 is highly sophisticated and is probably part of an important cyberespionage operation, the head of the malware analysis team at antivirus vendor Kaspersky Lab said.

[snip]

Adobe is working on a patch, but in the meantime users of Adobe Reader 11 are advised to enable the Protected View mode by choosing the "Files from potentially unsafe locations" option under the Edit > Preferences > Security (Enhanced) menu.

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When I checked my own Adobe options, I discovered that I did not have that option selected. You can read more here...

http://www.pcworld.com/article/2028163/adobe-confirms-zeroda...