Hagen’s flying squirrel is known from northern Sumatra and Kalimantan in Indonesia. It is arboreal and nocturnal.
The back is slate gray with brown-tipped hairs, and the underside ranges from white to reddish. The ears have long, stiff hairs, the tail is brown, and the black gliding membrane has reddish-brown tips.
It is nocturnal and arboreal. Habitat records are limited, but the monograph reports a collection site in primary forest in Sumatra where the animal was associated with durian trees.
An extinction-risk assessment has not been added yet.