How do MAS pilots get weather, etc. enroute when over oceans? Wait for VHF? I find that hard to believe- it's a global airline. If true, it says a lot about the operation in general.
They would use HF ACARS (link to a list of HF ACARS ground stations is here:
HF ACARS
As posted earlier, the nearest F ground station is at Hat Yai (south Thailand).
They would also use HF voice comms for weather reports etc.
A link to a list of HF aeronautical stations is here:
http://www.canairradio.com/hf.html
For the region of interest, there are HF ground stations at KL, Singapore, Bangkok etc.