Taijul Islam finished with six wickets as Bangladesh dismissed Pakistan for 358 to complete a 78-run win in the second Test and a 2-0 sweep of the series.
The left-arm spinner took two of the three wickets to fall on the final day and returned figures of 6-120 from 34.2 overs to help clinch the series.
The tourists were 7-316 on day four and added 42 runs on the fifth morning before losing the remaining wickets as Bangladesh rushed to victory.
Bangladesh won the first Test by 104 runs.
The victory marked Bangladesh's second successive series sweep against Pakistan, having previously completed a 2-0 victory in 2024.
The end of Mohammad Rizwan's defiant, 166-ball innings signalled the end of Pakistan's hopes of chasing down an improbable victory target of 437.
