From:
Secunia (secunia.com/advisories/30832/)

Rating:
Highly critical

Description:
A vulnerability has been reported in Adobe Reader/Acrobat, which potentially can be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to an error in the implementation of an unspecified JavaScript method and can be exploited to cause a crash or potentially execute arbitrary code via a specially crafted PDF file.

NOTE: The vulnerability is reportedly being exploited in the wild.

The vulnerability is reported in the following products and versions:
* Adobe Reader versions 8.0 through 8.1.2
* Adobe Reader versions 7.0.9 and earlier
* Adobe Acrobat Professional, 3D and Standard versions 8.0 through 8.1.2
* Adobe Acrobat Professional, 3D and Standard versions 7.0.9 and earlier

Solution:
Adobe Reader 8 for Windows:
Update to Adobe Reader 8.1.2 Security Update 1.
adobe.com/support/downloads/detail.jsp?ftpID=3967

Adobe Reader 8 for Macintosh:
Update to Adobe Reader 8.1.2 Security Update 1.
adobe.com/support/downloads/detail.jsp?ftpID=3966

Acrobat 8 for Windows:
Update to Acrobat 8.1.2 Security Update 1.
adobe.com/support/downloads/detail.jsp?ftpID=3976

Acrobat 8 for Macintosh:
Update to Acrobat 8.1.2 Security Update 1.
adobe.com/support/downloads/detail.jsp?ftpID=3977

Acrobat 3D Version 8 for Windows:
Update to Acrobat 3D Version 8.1.2 Security Update 1.
adobe.com/support/downloads/detail.jsp?ftpID=3975

Adobe Reader 7.0 through 7.0.9:
Upgrade to Adobe Reader 7.1.0.
adobe.com/go/getreader

Acrobat 7 for Windows:
Update to Acrobat 7.1.0.
adobe.com/support/downloads/product.jsp?product=1&platform=Windows

Acrobat 7 for Macintosh:
Update to Acrobat 7.1.0.
adobe.com/support/downloads/product.jsp?product=1&platform=Macintosh

Thanks Thomas

Another reason to use Foxit Reader