Warner, who endured a torrid time in the Ashes with just 95 runs in 10 innings, enjoyed a dramatic reprieve while batting on 56.
The aggressive stroke-maker was adjudged out caught-behind soon after reaching his half-century off the bowling of teenage pace sensation Naseem Shah before the TV umpire spotted the bowler had overstepped the line.
He then rode on his luck to punish Pakistan's inexperienced attack, which failed to employ lateral movement on an uneven playing surface.
Warner's glorious knock was brimful of authoritative drives through the cover region while he emphatically flicked any delivery marginally pitched on the leg-stump.
The 33-year-old was tormented by England paceman Stuart Broad throughout his trip to England, perishing to his round-the-wicket strategy on seven occasions.
Pakistan, on the other hand, did not opt for this plan, deemed as Warner's kryptonite, straight away and let the opening batsman settle into his groove.
Warner briefly found himself subject to the case of the 'nervous nineties' and survived a close run-out decision when a direct hit from Yasir Shah almost had him short of the popping crease.
He spent the tea break anxiously stranded on 99 after taking a single on the final ball prior to the interval.
Later, Warner had to wait for nine balls before taking the one run that brought up the 22nd ton of his Test career and his first since the Boxing Day Test against England in 2017.
Warner was slapped with a one-year ban from international cricket by the Australian board for his involvement in the ignominious ball-tampering scandal in Cape Town last year.
Although he instantly made his presence felt in limited-overs cricket with stellar performances in the World Cup and the home T20Is against Sri Lanka and Pakistan, Warner has been forced to patiently wait for success in the longest format.