Authorities haven't confirmed the identity but say that the body is white and female.
He continued: "The charity will update as soon as possible".
Mohammed Yusop, the state police chief, said: "I can confirm a body has been found in the Betembum mountains. It is not in an accessible place".
Negeri Sembilan state police chief Mohamad Mat Yusop said officials were in the process of determining whether the body is Nora Anne Quoirin, who was discovered missing by her family from the Dusun eco-resort in the southern state on August 4.
A window in the room, which could be opened only from the inside, was open.
Reacting to the development, Tánaiste Simon Coveney said Irish and French embassies in Malaysia are working together to provide every assistance to the Quoirin family.
August 6: Nora's family said they believed her to have been abducted.
Appearing before cameras on Monday, her mother said: "Nora is our first child".
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She has an Irish passport and hasn't been seen since Sunday.
"She never goes anywhere by herself".
While announcing the reward, they described the 15-year-old as being "so precious to us", adding their "hearts are breaking".
According to the New Straits Times, a police forensics unit vehicle was spotted entering the cordoned-off resort at 3.30pm.
And a shaman drafted in by police to help with the search claimed missing Nora had been lured away from the eco-resort in Malaysia by a "genie".
State fire and rescue department assistant director Ahmad Mukhlis Mokhtar told journalists: "Previously, our detective canines had spotted footprints, but when we conducted a search there, we couldn't find her".
About 350 people had been searching for Nora in dense jungle near the resort.