Fans seated around the Hawthorn supporter alerted authorities immediately and he was escorted from the stadium within minutes.
The supporter, sitting in the RACT Stand, had a young boy with him at the time.
It is unclear whether the abuse was racial in tone, but the supporter was howled down by those sitting nearby.
Hawks chief executive Stuart Fox said the club was seeking to establish whether he is a club member. If so, he could have his membership cancelled.
He said the Hawks had a "zero tolerance approach" towards anyone who vilifies a player, official or supporter. "Racial vilification at the football in any form is offensive and totally unacceptable," he said.
North coach Brad Scott said Daw only learned of the incident after the game.
"Unfortunately there are still idiots out there, but if anything good was to come out of it, it was a hawthorn supporter but other Hawthorn supporters around made it known to him that it wasn’t on and those supporters are to be applauded," he said.
"It is disappointing. Majak has been through a lot in his life – far worse than this – but it is disappointing that these things still exist."
It is not the first time the Sudanese-born player has been subject to abuse at the football. In May last year, two Western Bulldogs supporters were evicted from Etihad Stadium last year for abusing Daw.
In 2012, a supporter was thrown out of Aurora Stadium for racially abusing then-Hawk forward Lance Franklin.
