Adobe is aware of a report of a potential vulnerability in Adobe Illustrator CS4 (CVE-2009-4195). We are currently investigating this issue and will have an update once we have more information. It appears that this issue would require a local user to take the action of opening a malicious .eps file in Illustrator.
http://blogs.adobe.com/psirt/2009/12/potential_adobe_illustrator_cs.html