This indicates an attack attempt against an information disclosure vulnerability in Adobe Acrobat and Reader.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted PDF file. A remote attacker may be able to exploit this to gain information about files on victim system via a crafted PDF file.
Adobe Acrobat Reader versions 7.0.1 and 7.0
Adobe Acrobat versions 7.0.1 and 7.0
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Upgrade to the latest version of Adobe Acrobat or Reader