Soon to be replace by the Dassault Falcon 7X Special purpose aircraft, this is a fictional, but true to realism smaller jet aircraft used by the Royal Australian Air Force.
They are part of the Special Purpose Aircraft fleet, operated by No. 34 Squadron from Defence Establishment Fairbairn in the Australian Capital Territory.

The smaller jets are used for regional and interstate travel for VIP and government officials. 

An interesting read about the 'real' aircraft here: Flights for Mathias Cormann’s European campaign for OECD job could cost taxpayers $4,300 an hour.