Adobe Systems Inc. patched five critical vulnerabilities behind the scenes when it updated its Reader and Acrobat applications earlier this month to fix a bug already under attack. Adobe fixed three critical-severity flaws in Adobe Prelude, Adobe Experience Manager and Adobe Lightroom. The vulnerabilities could enable arbitrary code execution and are part of a 14-CVE patch update. The updates to Reader 9.1 and. Acrobat 9.1 included patches for not just one bug as Adobe indicated at the time but for five other vulnerabilities as well.
Source: https://threatpost.com/adobe-lifts-curtains-secret-pdf-patches-032509/72483/