Trojan.Agent refers to a generic Trojan malware detection. It is used for detections that are either associated with no specific malware families or not enough information is available to pinpoint the malware family.
Backdoor.Agent.PGen is a generic detection for backdoors using specific Windows registry keys.
Backdoor.Agent.PGen use the following specific registry keys to gain persistence:
Malwarebytes protects users from Backdoor.Agent.PGen by using real-time protection.
Malwarebytes can remove Backdoor.Agent.PGen without further user interaction. It is recommended to do a full system scan since this backdoor may have been used to install more malware on the system.