The Malayan Mountain Maxomys is a rodent of montane Peninsular Malaysia. Long fur includes stiff, spine-like hairs, and the back is a reddish ochre-brown.
Long fur is mixed with stiff, flattened spines. The back ranges from yellowish reddish brown to ochre-rufous, grizzled with black; the underside varies from gray to chestnut and pale buff shades.
It is usually recorded in montane habitat above 900 m; records from Pahang are at 1,080–1,630 m. Caterpillars are among the recorded foods, and one specimen was reported with a litter of three.
An extinction-risk assessment has not been added yet.