This is a Yellow-throated Marten. Marten are in the Mustalid family like weasels, ferrets, otters, badgers, etc.
This species is about 2.5ft to 3ft long (nearly a meter) and they are predators.
While I've had many sightings in China and Malaysia, they almost never seem to hold still for a pic.

Click this link to watch a camera trap video from China of this same species.

Tawau Hills, Borneo - Malaysia
August 2018