High Court judge Nazlan Mohammed Ghazali found Najib guilty on all counts brought against him -- abuse of power, money laundering and criminal breach of trust -- in the current trial, which relates to $10 million of funds which were deposited into his personal accounts from a former unit of 1MDB.
Najib has consistently argued his innocence, welcoming the trial -- which he fought against tooth-and-nail before being deposed as prime minister -- as a chance to clear his name.
Ahead of Tuesday's verdict, he wrote on Facebook that "no matter what the decision is tomorrow in the High Court, it doesn't end here," indicating that he would appeal. "I don't give up," he added.