What horror/thriller movie was this?

I remember one time there was this movie that I accidentally stumbled upon. I remember that they were a group of people/friends, around aged 20s to 30s. They were hikers. They went up a mountain/desert. In it somehow they got lost. Now the premise is almost similar to the movies "The Hills Have Eyes" & "The Descent" but what attacked them was a supposedly a French Boy who survived a plane crash at a young age. Now due to him surviving only by instinct he has lost himself and reverted to a primitive state. All I remember after that is the final scene where 2 girls kinda survive and woke up after. 1 girl tried to eat a cooked meat only to realize that it was one of them who was cooked. Immediately after she started vomiting what she eat in where she saw the picture of the boy. They boy who is now grown up saw her and the girl started to try to speak in French. Angry he killed the other girl and raped the last survivor. And that's it. Can anyone help me finding this? I was hoping to recommend this for a video explanation on Youtube. Please excuse my grammar, by the way. I'm only typing as I remember how it was.