A new vulnerability has been found in Adobe Reader and Adobe Acrobat. In order to stay protected until a patch is issued, Adobe recommends that users disable JavaScript in these programs.
Disabling JavaScript is a fast, simple procedure. From within Adobe Reader, go to Edit, choose Preferences, then on the left-side of the window, click JavaScript. Uncheck Enable Acrobat JavaScript, then click OK.
Adobe is expected to issue a patch for this vulnerability during the second week of January. Until then, you can stay protected by disabling JavaScript.