This indicates an attack attempt to exploit an Arbitrary File Upload vulnerability in PrestaShop.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application when handling a craft HTTP upload request. A remote attacker may be able exploit this to upload, and execute arbitrary code within the context of the application.
PrestaShop version 126.96.36.199 and prior
PrestaShop version 188.8.131.52 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.