According to Adobe, the publisher of Acrobat, a popular program used to create and open PDF files, there is a vulnerability which could affect users of Reader and Acrobat.

Acrobat 9.2 and earlier versions are being exploited. There won’t be an update released to fix this matter until January 12th. Until then, to reduce the possibility of being infected, “disable JavaScript in Reader and Acrobat to protect themselves until next Tuesday, when Adobe ships the fix.” Computerworld Staff, Computerworld (2010, January 7. Large-scale attacks exploit unpatched PDF bug. [Electronic version].