Chasing a target of 227, Pakistan opener Saim Ayub did wonders for his team as he smashed the first ball of the chase for a boundary before he also hit a six.
Bangladesh fought till the end in the final T20I but couldn't get across the line due to a lacklustre batting performance and stellar bowling from the hosts.
After the victory, Southee talked about the tricky surface and heaped praise on both batters for playing their game despite the various challenges on the surface.
New Zealand Test skipper Tim Southee slammed the pitch at the Shere Bangla National Stadium in Dhaka and called the wicket the "worst" he has seen in his career after Blackcaps tied the two-match Test series with Bangladesh.
Tom Latham will lead the side that misses several senior players from the World Cup squad. Kane Williamson, Tim Southee, Daryl Mitchell, Mitchell Santner, Glenn Phillips and Devon Conway are not part of the squad.
Mitchell Santner and Glenn Phillips' three-wicket hauls helped New Zealand to dominate over Bangladesh on the first day of the second Test at Shere Bangla National Stadium in Dhaka on Wednesday.
New Zealand tailenders Kyle Jamieson and Tim Southee frustrated Bangladesh bowlers for the opening 17 overs of the day. They first took down the trail of 44 runs and started to hurt Bangladesh with each run contributing to lead over the Tigers.