Adobe has released updates for Acrobat and Acrobat Reader. These updates correct several critical vulnerabilities that could cause an unauthenticated attacker to execute arbitrary code on the target computer, use up all your toilet paper, or kick your puppy.
http://www.adobe.com/support/security/b ... 10-28.html
http://www.kb.cert.org/vuls/id/298081
It is advisable to update Reader, if you have it installed.