Muhammad Imran, Shakeel Abbasi and Sohail Abbas scored two goals each for Pakistan, and Taposh Barmon scored the only goal for Bangladesh.
Pakistan was leading the game by 6-0 up to the 63rd minute, after which Bangladesh successfully scored the goal.
Earlier, Pakistan was defeated 3-2 by India, making this a crucial match to win.
The semi-final will be played on November 23.
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