This indicates an attack attempt to exploit a Remote Code Execution vulnerability in HP Managed Printing Administration.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application when handling HTTP POST request. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, by uploading a malicious ASP script.
HP Managed Printing Administration before v2.6.4
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.