I don't think it should be a problem. I'm basing this on what we face if we apply to overseas public unis. STPM is accepted. I don't see why yours isn't. You could visit University Malaya and ask them yourself. It wouldn't hurt. Every university has an international students quota including UM. Hope this helps!
"Our deepest fear is not that we are inadequate. Our deepest fear is that we are powerful beyond measure. It is our light, not our darkness that most frightens us. We ask ourselves, Who am I to be brilliant, gorgeous, talented, fabulous? Actually, who are you not to be?" -Marianne Williamson