This article is an easter egg from a digital media, such as video games, but has been deemed canon by either the author or the Star Wars licensees, and thus should be taken as a part of the "real" Star Wars universe.
Max had been staying with a female Human in the city of Barons Hed on Sulon, during the time when Katarn was attempting to track down 8t88 and a stolen map to the Valley of the Jedi. Katarn, curious as to what a certain locked house in the city was hiding, lay in wait until the woman returned and unlocked her door. Seizing the opportunity, Katarn burst through. What he saw?other than the frightened woman?was a short, armed rabbit with a maniacal grin.
After some nudging on Katarn's part, Max joined the Jedi mercenary in defeating the various thugs who had been terrorizing Barons Hed. He and Katarn parted ways upon reaching Government House in the city's center.
Check the rest of the article to read about when Max again teamed up with Kyle Katarn, and how Max's likeness has been emblazened throughout the Star Wars universe.