Definitely Masked palm civet in my opinion, subspecific identification is hard as it's a highly variable species (and a lot of subspecies are dubious) but it's not leucomastyx as that subspecies is generally very dark bodied.
It's most likely to be ssp. jourdanii (now lumped with other subpopulations as ssp. annectens by HMW) or the Bornean leucocephala both of which have striking white faces and are native to Malaysia [jourdanii: 1, 2, leucoephala: 3, I have a picture somewhere of an individual seen in Trus Madi that also had a very pale face]
@Père Damian's Deer
Thanks for your opinion!
It will be really interesting if it was a Paradoxurus jerdoni, but it looks more like one of the Southeast Asian subspecies of Paguma larvata.