MAS Kargo owns the above mentioned aircraft but leases aircraft from Atlas Air and World Airways too.
They operate from Kuala Lumpur to Penang, Johor Bahru, Kuching and Kota Kinabalu locally. They also operate flights to Singapore, Bangkok, Jakarta and Manila using their 737Fs.
MAS Kargo also operates to Hong Kong. Flights to Melbourne, Sydney, Dubai, Osaka and London-Heathrow are operated jointly with Virgin Cargo although I think MAS Kargo have switched their Australian operations to Avalon. In Europe, MAS Kargo set up a fully computerised European Cargo Facility at Hahn and as mentioned now operates daily into Hahn via Dubai. MAS Kargo has announced that a similar facility will be developed at Sharjah.
MAS Kargo also operates a joint service with Swissair to Basle/Mulhouse and Chicago.
Will find out more once my new timetable arrives.
ps. MAS does not operate passenger flights in the MH6xxx range. All MAS Charter services and extra flights are in the range MH7xxx and occasionally MH4xxx.