Jamal was sitting right in front of the petrol pumps when a BMW pulled up, CCTV footage of the incident shows.
Unsure of what to do, the boy got up to move, but then scared by the car sat back down and pulled his legs in.
What happened next was bizarre and apparently completely unprovoked. The 29-year-old driver got out of the car, opened his gas tank and lifted up the pump. He then grabbed Jamal and sprayed petrol in his mouth, before starting to fill up his tank.
The frightened boy ran away.
In another CCTV shot from inside the shop, the boy can be seen coming in and trying to wipe the taste from his mouth.
The driver paid for his petrol before driving off. Die Express reports that before he left he laughed at the child.
A worker at the gas station called an ambulance and the child was treated by a psychologist.
The boy's mother Merna told the paper “What kind of person would do such a thing? Since the attack Jamal is totally different.”
The driver was quickly identified by police who are treating the incident as potential grievous bodily harm, reports the Hamburger Abendblatt.