The boy suffered abrasions to his forehead, arms and hands, police said.
Timothy Miller, 26, was charged with kidnapping, resisting arrest and child neglect.
He was ordered held without bail Thursday after a man told the court that he knew Miller had just graduated from college and has a drug problem, the Palm Beach Post reported.
“On Facebook, it’s going, like, viral,” the man said, alluding to media reports of Miller’s arrest, the paper reported.
An arrest report said the boy told police he got into the pickup after Miller assured him “he won’t do anything weird.”
The boy said that, once he was in the pickup, Miller asked him for drugs, looked at him strangely and began driving erratically, the report said. He told investigators that Miller's behavior frightened him.
When the boy tried to get out, however, Miller told him he couldn’t leave and sped up, the report said.
According to the report, police were called by people who witnessed the boy jumping out of the vehicle. One of those witnesses followed Miller onto I-95 and detained him until police arrived
Miller told police he approached the boy to purchase drugs, the report said.