Adobe is planning an out-of-cycle emergency patch to fix a serious flaw in its Reader package.

A new security flaw discovered in PDF readers doesn't require JavaScript in order to execute programs on your PC - and isn't limited to Adobe's Reader, either.

Adobe's Acrobat PDF-maker and Reader PDF-viewer are under active attack by crackers exploiting an as-yet undetailed flaw in the software's security.

Security researchers have identified a Trojan which attacks a flaw in Adobe Reader's JavaScript handling to insert a backdoor - and a patch isn't due until tomorrow.