Have you read my thread about how to identify an outlaw? https://forums.frontier.co.uk/showthread.php?t=235027
Based on your description, I think a more accurate term according to the dichotomy for this outlaw is a Marauder. However since they're out there in a corvette, they're likely a Coward Marauder but they could be a Reaving Marauder given we don't know if they specifically target weaker ships or any ships.
He's probably not out there to fight all the well-armed combat ships and fighter wings.
I've said it before, and I'll say it again: People who do stuff like that aren't attacking player characters, they are attacking other players. No need to honor them with any role-playing titles.