Najib Abdul Razak’s legal team has contended that the prosecution’s appeal in the 1MDB audit case against the former prime minister is defective.

This is because prosecutors have not filed a petition of appeal in the case, which also involved 1MDB’s former CEO Arul Kanda Kandasamy.

Najib and Arul Kanda’s lawyers confirmed that the prosecution has yet to file the petition of appeal, following prosecutors...