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.
If you'd like to learn more about the current vulnerability, read Adobe's Security Advisory for Adobe Reader and Acrobat.