A rare or unknown animal, as the news reports suggest?
Skeptics aren't so sure. Sharon Hill, a writer at Doubtful News.com, points out that the photo and description "screamed badger" to her-specifically one type of small mammal native to the region, a Indonesian stink badger (Mydaus javanensis), which is related to skunks (hence the "stink" in the name and on the carcass). It matches the animal that attacked the men in nearly every detail.
Left unexplained is why the farmer and others could not identify the badger, though just because an animal is native to an area doesn't necessarily mean that everyone who lives there will recognize it. Many animals are nocturnal and avoid contact with people, or spend their lives in water or woods. Ornithologists can spend months or even years trying to spot birds well within their natural habitat ranges.