This indicates an attack attempt to exploit a Code Execution Vulnerability in Adobe Reader Mobile.
The vulnerability is due to an error when the application handles a crafted PDF file. A remote attacker could exploit this to execute arbitrary codes within the context of the application, via a crafted PDF file.
Adobe Systems Adobe Reader Mobile for Android prior to 11.2
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the latest update from the vendor.