He lured the boy into his car after telling him he wanted help with directions.
Abu Dhabi Criminal Court of First Instance heard the man in his 20s found the boy outside his home in the capital early this year.
He then lured him into his car after telling him that he wanted his help for directions to a nearby construction site.
The Emirati, however, drove the boy, aged below 10, to a remote area where he allegedly undressed him and assaulted him sexually, including touching him inappropriately and playing with his private parts.
Official court documents showed that after sexually abusing the child, the man filmed him while naked.
"He threatened the boy that he would share the video of him among his friends on social media if he told anyone about the incident, before dropping him back near his home," said a prosecutor.
The parents of the child filed a complaint against the man after his mother noticed a change in her son's behaviour, who had also appeared to be confused after he was abused.
"My son told me that the man took him in the car to a deserted area where he forcibly removed his clothes and sexually abused him," the mother told authorities.
"The boy said the man also took pictures and a video of him while naked and told him not tell anyone about what happened or else he would share the pictures with my sons' friends."
Prosecutors had charged the Emirati with sexual assault and threatening the small boy.
The young man denied the charges when he appeared in court.
The lawyer representing the child's family requested that the Emirati's mobile phone be taken to the laboratory for tech expats to examine whether some indecent video clips had been recently deleted from the phone.
The trial was adjourned until April 12.
ismail@khaleejtimes.com