Adobe is looking into ways to mitigate a PDF attack demonstrated by Belgian security researcher Didier Stevens that does not require an underlying vulnerability.
An IDG News Service article in The New York Times quotes Steve Gottwals, a group product manager at Adobe, as saying:
We are currently researching the best approach for this functionality in Adobe Reader and Acrobat, which we could conceivably make available during one of the regularly scheduled quarterly product updates.
Foxit has already released an update for its PDF Viewer, but Stevens says it offers no protection. Meanwhile, another researcher, Jeremy Conway, has discovered another way to spread malicious code across PDF documents on a victim's computer.