Adobe released security updates for Adobe Reader 9.4 (and earlier versions) for Windows, Macintosh and UNIX, and Adobe Acrobat 9.4 (and earlier 9.x versions) for Windows and Macintosh. It could potentially allow an attacker to either crash the application or take control of the system. [1]

This update address CVE-2010-3654 noted in a previous Security Advisory APSA10-05 and CVE-2010-4091 referenced in the Adobe PSIRT blog, it also includes the Adobe Flash Player update noted in Security Bulletin APSB10-26.
 

[1] http://www.adobe.com/support/security/bulletins/apsb10-28.html

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Guy Bruneau IPSS Inc. gbruneau at isc dot sans dot org