Put into bat, Australia first posted a competitive 207 in the stipulated 50 overs and then skittled out Pakistan for 182 in 46.4 overs.
Pacer Josh Hazlewood's four-wicket haul and left-arm spinner Luke Doran's three scalps to bring the downfall of the former champions Pakistan.
Chasing 208 to win, Pakistan batsmen could not capitalise on their starts and the team kept losing wickets in regular intervals.
Skipper Azeem Ghumman top scored with a 90-ball 41, which included just one four and the only partnership that gave Pakistan's total some respectability was the 54-run first wicket stand between Ahmad Shahzad (36) and Muhammad Babar (28).
Earlier batting first, Australia recovered after being reduced to 23 for three inside five overs. A 57-run stand between Jason Floros (35) and Alex Keath (25) resurrected their innings before a run-out saw the former back into the hut.
Alex also didn't last long and was dismissed after 15 balls as Australia slipped to 127 for six in 34.5 overs but a fruitful 62-run partnership between Tim Armstrong (37) and Kane Richardson (44) pulled them out of the crisis.
Australia Under-19s innings (50 overs maximum)
NJ Maddinson lbw b Fayyaz Butt 0
TM Beaton c Babar Azam b Sarmad Bhatti 5
MR Marsh* c †Mohammad Waqas b Fayyaz Butt 7
AR Keath c Rameez Aziz b Raza Hasan 25
JS Floros run out (Hammad Azam) 35
TJ Armstrong b Sarmad Bhatti 37
TIF Triffitt† c †Mohammad Waqas b Babar Azam 21
KW Richardson c Ahmed Shehzad b Sarmad Bhatti 44
JR Hazlewood run out (Usman Qadir/Sarmad Bhatti) 5
LA Doran not out 9
AC McDermott not out 3
Extras (LB 2, W 14) 16
Total (For nine wickets in 50 overs) 207
Fall of wickets: 1-2, 2-10, 3-23, 4-80, 5-82, 6-127, 7-189, 8-189, 9-199.
Bowling: Fayyaz Butt 7-0-37-2, Sarmad Bhatti 8-0-33-3, Raza Hasan 10-3-21-1, Hammad Azam 2-0-23-0, Usman Qadir 10-0-35-0, Ahmed Shehzad 7-0-22-0, Babar Azam 6-0-34-1.
Pakistan Under-19s innings (target: 208 runs from 50 overs)
Babar Azam c †Triffitt b Doran 28
Ahsan Ali c Beaton b Hazlewood 2
Ahmed Shehzad lbw b Doran 36
Azeem Ghumman* b Floros 41
Rameez Aziz b Doran 23
Hammad Azam c †Triffitt b Hazlewood 0
Mohammad Waqas† c Hazlewood b Keath 13
Sarmad Bhatti b Hazlewood 10
Usman Qadir c †Triffitt b McDermott 9
Raza Hasan c †Triffitt b Hazlewood 10
Fayyaz Butt not out 4
Extras (W 3, NB 3) 6
Total (all out in 46.4 overs) 182
Fall of wickets: 1-15, 2-69, 3-74, 4-110, 5-111, 6-130, 7-156, 8-166, 9-168, 10-182
Bowling: JR Hazlewood 8.4-1-30-4, AC McDermott 8-0-50-1, KW Richardson 7-1-20-0, TJ Armstrong 2-0-13-0, LA Doran 10-1-32-3, JS Floros 8-1-19-1, AR Keath 3-0-18-1.