Chief Justice Gita Mittal administered the oath to Malik at the sprawling lawns of the Raj Bhawan.
His warrant of appointment by President Ram Nath Kovind was read out by Chief Secretary B.V.R. Subrahmanyam.
Former Chief Ministers Farooq Abdullah and Mehbooba Mufti, Union Minister of state (PMO) Jitender Singh, judges of the Jammu and Kashmir High Court, legislators and senior civil and Army officers also attended the event.
When the media approached Malik to comment on his appointment, he said: “The Governor does not speak.”