The opening bowling pair of Mohammad Asif and Mohammad Sami produced a lethal attack routing the Aussies for a mere 127 runs in the first innings on the opening day of the second Test match at the Sydney Cricket Ground (SCG).
Pakistan in reply were 14 for no loss with Imran Farhat (9) and Salman Butt (3) at the crease when the play ended early due to bad light.
Mohammad Asif grabbed six wickets for 41 runs, his career best, while Mohammad Sami, playing for the first time in more than two years, dismissed Australia's three top-order batsmen and Umar Gul claimed the last wicket.
The main scorers for Australia were Mitchell Johnson (38), Michael Hussey (28) and Nathan Hauritz (21) while Marcus North was the only other batsman to reach double figures.
Captain Ricky Ponting and opener Phillip Hughes, coming in for the injured Simon Katich, were got out for a duck as both were removed by Sami on successives deliveries.
Shane Watson, fresh from making his maiden Test century in Melbourne, opened the innings with Hughes and could score only six.
Earlier, captain Ricky Ponting won the toss and elected to bat first on the rain-affected pitch. The play started after lunch in overcast conditions on a pitch with plenty of grass on it.
Australia made one change in their team with Phillip Hughes at the top of the order while Pakistan made three changes with bowlers Sami, Umar Gul and Danish Kaneria replacing injured Mohamamd Aamer, Abdul Rauf and Saeed Ajmal.
Australia: Phillip Hughes, Shane Watson, Ricky Ponting (captain), Mike Hussey, Michael Clarke, Marcus North, Brad Haddin, Mitchell Johnson, Nathan Hauritz, Peter Siddle, Doug Bollinger. 12th man: Clint McKay.
Pakistan: Mohammad Yousuf (captain), Imran Farhat, Salman Butt, Faisal Iqbal, Misbah-ul-Haq, Umar Akmal, Kamran Akmal, Mohammad Sami, Umar Gul, Mohammad Asif, Danish Kaneria. 12th man: Khurram Manzoor.