Risk: High
A vulnerability caused by an unspecified PDF processing error in Adobe Reader 6.x and 7.x can potentially be exploited by malicious people to compromise a user's system.
The vulnerability can be exploited to cause a heap corruption and may allow execution of arbitrary code when a specially crafted PDF file is opened.
Adobe has issued a support bulletin to address the problem, which is available at:
http://www.adobe.com/support/security/bulletins/apsb07-01.html