The team’s unpredictable nature

Pakistan would definitely enter the tournament as one of the underdogs. This is because no one expect them to win the esteemed trophy. However if we see the history, the Men in Green has the reputation of surprising everyone and outperform their opposition.
The best example of this is the 2017 Champions Trophy where they defeated hot favourites India in the final. As there is no expecting, the team will enter the tournament with less pressure on them.
Given the strength that the team possesses, they can upset any best team and ultimately win the title. Their unpredictable nature is one of their biggest strength in their way of winning the trophy.