Did you know that Red Pandas aren't actually bears at all? They're closer to skunks and raccoons, evolutionarily speaking. The pumpkin's just a pumpkin, though. Not everything has to be complicated.
Another possibility: some talented madman genetically engineered this genus-bending weasel-creature for maximum adorability and pumpkin handling panache. Don't scoff. With the above video as evidence, it's the only explanation that really makes any sense.