OK,
There's a new exploit out for Adobe Acrobat Reader. It even affects the new 9.1 version. The workaround to keep from getting infected is to simply change a setting on it to disable running embedded javascript code.
Open up Adobe Acrobat Reader program and click: Edit -> Preferences, Click the JavaScript option on the left and uncheck the "Enable Acrobat JavaScript" box. Click OK.
Sigh... If it's not one thing, it's another with these jackasses.