I stumbled upon this French consulting and rating agency in higher education, EDUNIVERSAL. Annually, it ranks over 1000 business schools around the world and categorised them according to number of PALMS; between 1 and 5 PALMS. You can read more in its Wikipedia.
6 Malaysian universities were grouped into 3 PALM categories. There are as below:
I also suggest that you visit the respective universities' MBA website and talk to the alumni, students or admissions officers for more information.