This indicates an attack attempt to exploit a Command Execution vulnerability in Ghostscript.
The vulnerability is due to improper validation of user supplied inputs when handling a crafted EPS file. A remote attacker may be able to exploit this to execute arbitrary command within the context of the process, via a crafted EPS file.
Ghostscript version 9.21 and prior version
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrades or patches from the vendor.