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.Neutrino is the detection for the trojan that is the payload dropped by the Neutrino Exploit Kit.
This backdoor is typically dropped by the Neutrino EK. This trojan allows the threat actor to download and execute more malware on the infected system.
Malwarebytes protects users from Backdoor.Neutrino by using real-time protection (if the anti-exploit module doesn’t get it first).
Malwarebytes can detect and remove Backdoor.Neutrino without further user interaction.