Malan shared a crucial 92-run stand in Canberra with Moeen Ali (44) as England compiled 178-7 against a full-strength Australian attack.
Despite Mitchell Marsh hitting 45 off 29 balls and Tim David 40 off 23, the hosts fell short. Sam Curran took 3-25 to ensure England won the three-match series 2-0 with a game left on Friday in a setback to the World Cup champions. "Really satisfying win after losing the toss as well and setting a target," said England skipper Jos Buttler. "I think we showed great character and Malan played fantastically well to anchor the innings." Malan hit seven fours and four sixes in his 49-ball knock to rescue the visitors after they slumped to 54-4 in the ninth over.
Ali was also impressive after Australian captain Aaron Finch won the toss and chose to bowl, making five changes to the side that also lost by eight runs in Perth.
Pace spearheads Pat Cummins, Mitchell Starc and Josh Hazlewood, along with spinner Adam Zampa all returned for the hosts after being rested for the first T20.