Whichever way the verdict goes on Tuesday in the first 1MDB corruption trial of Malaysia's former leader Najib Razak, the outcome will be fraught with risk for Prime Minister Muhyiddin Yassin, political sources and analysts say.

A guilty verdict could boost Muhyiddin's credibility with the public, but weaken his coalition, which counts Najib's Umno as its biggest component - and potentially trigger snap polls.

An acquittal...