Brian Krebs writes in his Security Fix blog that Adobe is warning of yet another serious flaw in the Acrobat Reader product. Gee, what were the odds?
Installing and using the Adobe Reader app is like punching yourself in the face over and over again. It hurts and just doesn't make sense, so stop it already.
There are tons of other PDF readers available, so move to one of them, regardless of whether you're on Windows, Linux, or a Mac, uninstall Acrobat Reader, and start the healing process.
Security Fix - Adobe Warns of Potential Reader Flaw