clause 19 of Malaysian Employment Act:

19. Time of payment of wages

Every employer shall pay to each of his employees not later than the seventh day after the last day of any wage period the wages, less lawful deductions, earned by such employee during such wage period:
Provided that if the Director General is satisfied that payment within such time is not reasonably practicable, he may, on the application of the employer, extend the time of payment by such number of days as he thinks fit.

Looks like they are within rights to withhold your salary..