Mohammad Shahzad dived full length to his right and plucked the ball with one hand after Scotland's Matthew Cross edged it.
Mujeeb ur Rahman was the star bowler on the day as he recorded a fantastic five-wicket haul while conceding only 20 runs in four overs.
The game was turned around by a fantastic 86-run stand between Charith Asalanka and Bhanuka Rajapaksa for the fifth wicket.
Team India skipper Virat Kohli enjoys a fantastic record against Pakistan, with his performances helping the Indian team record wins in thrilling encounters.
The selectors decided to include Shardul as an additional seam bowler when it was clear that Hardik might not be able to roll his arm over.
Australia found their way to get those two crucial points in their first game of the Super 12 in the T20 World Cup against South Africa.
Running towards his right from long-on, Aiden Markram executed a full-length dive to catch the ball inches above from the ground.
Australia restricted South Africa to 118 for 9 in 20 overs thanks to some brilliant bowling by Josh Hazlewood, Adam Zampa and Mitchell Starc.
India is undefeated in its 12 ICC T20 and ODI World Cup clashes against Pakistan.
Aaron Finch will be eager to restrict South Africa to a modest total, which should not be a major concern considering the impressive bowling attack that Australia enjoys.