Her family say the sickening incident has left the victim so traumatised she will now no longer leave her home.
The 53-year-old woman lodged a complaint after her disgusting ordeal in the Malaysian capital of Kuala Lumpur.
CCTV footage shows the man holding his mobile phone with his right hand while masturbating with his left.
At one stage the woman steps back and appears to be trying to catch the man in the act by filming him with her smartphone.
The clip ends with the woman leaving the elevator and the man pushing the lift's buttons while he carries on pleasuring himself.
The footage was shared on social media by the woman's son in a bid to help track down the deviant.
The man said his mother had been on her way to visit a friend in the apartment building.
He said: "It was an abomination, what he did in front of my mother in the elevator.
"It has made her too traumatised to leave home on her own."
Assistant Police Commissioner Hamzah Alias confirmed the force had received a report over the incident.
"The victim was already inside the lift when a unknown man suddenly entered and performed the indecent act," he said.
He added that his officers are now working to track down the identify the man.
If caught, the man faces charges of gross indecency and prison.
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