This indicates an attack attempt against an Arbitrary File Upload vulnerability in ManageEngine DesktopCentral.
The vulnerability is caused by a lack of authentication error when handling an unauthenticated file upload. It allows a remote attacker to upload an arbitrary file onto vulnerable systems.
ManageEngine DesktopCentral 8.0.0 build 80293 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.