In this Malay name, there is no surname or family name. The name Mohd Ja'afar is a patronymic, and the person should be referred to by their given name, Adnan. The word "bin" or "binti"/"binte" means 'son of' or 'daughter of', respectively.
On 29 October 2008, Sultan Hassanal Bolkiah handed over Adnan's letter of credentials, amid his appointment as the new high commissioner to Australia. He previously served as Director of the Department of International Organizations at the Ministry of Foreign Affairs and Trade and as Deputy Permanent Representative at Brunei Darussalam's Permanent Mission to the United Nations in New York.[2]
After being appointed as the new ambassador to East Timor, on 15 January 2019, Adnan again received his letter of credentials at the Istana Nurul Iman.[3]Adaljiza Magno's remarks at the farewell reception on 16 November 2020 noted that Ambassador Adnan has strongly advocated for Timor-Leste's ASEAN membership since its inception.[4]