This attack could pose a serious security threat. You should take immediate action to stop any damage or prevent further damage from happening.
This signature detects an attempt to exploit a buffer overflow vulnerability in Adobe PDF Reader which may result in remote code execute.
Adobe Acrobat and Reader are prone to multiple arbitrary remote code-execution and security vulnerabilities.
Attackers can exploit these issues to execute arbitrary code in the context of the user running the affected application. Other attacks are also possible.
Download and install all vendor patches related to this vulnerability.