Article

A lot of Windows users still have Acrobat Reader 6.0.4, or older,
running on their systems. Last week these users were advised to
update their systems to the latest Acrobat Reader 6.0.5 because of a
security leak in version 6.0.4. Prior versions may be also
affected.

You can find more details about this in:

http://secunia.com/advisories/21016/

and
http://news.softpedia.com/news/Adobe-Patched-2-Reader-Vulnerabilities-29579.shtml

Now, of course you can upgrade to the latest 6.0.5 build. But it's wiser to install the latest 7.0.8 build. I wrote an article explaining exactly how to deploy this version by using ZENworks and Windows Installer.

Have a look here.