No, Malaysia Airlines does not serve pork on-board. But yes it does serve acoholic drinks. However, most of the the FA are quite selective on serving alcohol on-board. I mean they would almost never offer alcohol to Muslim passengers.
Malaysia is not an Islamic country, but it is a Muslim majority country where 55% population are Muslim (mostly are ethnic Malay) and the rest are Buddhist, Hindu, Christian and indigeneous beliefs. Islam however is the official religion of Malaysia although freedom of religion are practiced.