This indicates an attack attempt to exploit a Code Execution vulnerability in HP Sprinter.
The vulnerability is due to lack of validation for user supplied data when the vulnerable application handles a Tidestone activeX control. An attacker can exploit this by tricking an unsuspecting user into visiting a malicious webpage and execute arbitrary code within the context of the targeted users' browser.
HP Sprinter prior to v12.01
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor