One of the injured was a Filipina who was thrown out of the bus window, Malaysia's The Star Online reported Sunday evening.
"It was chaotic, people and things everywhere and I was (lucky) that I fell out from the bus through the broken side window when it skidded," it quoted the Filipina, initially identified as Ruby, 27, as saying when interviewed at the emergency room of Sultanah Nora Ismail.
Ruby was sleeping but woke up to loud noises, the report said.
The report described her as working in Johor Baru, and said she was going home after visiting her cousin in Kuala Lumpur.
Sunday's accident occurred at 107.2km of the North-south expressway, from Pagoh heading to Yong Peng. The bus crashed into the railing and ended up on the side of the highway.
The bus was traveling from Kuala Lumpur to Johor with 17 passengers, including some foreigners.
Killed were two men and a 10-year-old boy. The report did not immediately identify them.
The report also quoted a passer-by, Amil Ibrahim, 41, as saying he was driving to Yong Peng from Kuala Lumpur for business when he saw the wrecked bus.
He said he helped a few people to the side and aided some of the injured victims. He said many people were in panic and were crying. — JDS, GMA News