The Black Caps have claimed the tri-Nation title in Karachi and sounded out a warning to the hosts, five days before they meet again in the Champions Trophy opener at the same venue.
In the absence of the senior quick bowlers, Lockie Ferguson, Ben Sears and Matt Henry it was Will O'Rourke stepped up with 4-43 from 9.3 overs.
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The spinners, led by Mitchell Santner (2-20 from 10 overs), strangled Pakistan in the middle overs, limiting them to 242 all out in the final over.
At bat the New Zealand side scored 243-5 with 28 balls and five wickets to spare.
Devon Conway (48) and Kane Williamson (34) set the platform with a 71-run partnership for the second wicket.
Daryl Mitchell launched from there in the middle overs (57 runs) in an 87-run stand with Tom Latham who made 56 after being dropped twice and given a reprieve for an lbw as well.
Glenn Phillips sealed the win with 20 runs and Michael Bracewell two not out.