This item has a very low chance of being skinned from The Beast.
It was an ingredient for Breastplate of Bloodthirst, Cap of the Scarlet Savant, and Leggings of Arcana. It became useless when the quests were removed, but for some reason it remained.
UBRS is receiving the revamp treatment in 6.0.2, hopefully Blizzard will finally remove this item from the loot table and thus stop confusing newer players. Pristine Hide of the Beast is indeed gone in Warlords of Draenor.