Adobe has republished security bulletin APSB09-015 to address multiple vulnerabilities in Adobe Reader and Acrobat. These vulnerabilities may allow an attacker to execute arbitrary code, escalate local privileges, or cause a denial-of-service condition.
Source: http://www.us-cert.gov/current/index.html#adobe_releases_security_bulletin_for7

Bulletin: http://www.adobe.com/support/security/bulletins/apsb09-15.html
Previous news: http://www.helpmyos.com/latest-computer-news-f43/hackers-play-around-and-exploit-the-fourth-pdf-zero-day-of-the-year-t1302.htm