Pittsburgh pushed in the third period - as they outshot the Avs 18-10 - and were rewarded late in the frame to tie the score with an equalizer from Rust that sent the game into overtime.
Francouz abandoned his crease to try and poke a puck away from Jason Zucker outside the right faceoff circle, but Zucker held on possession of the puck and centered the puck to the net. It skipped to the backdoor where Malkin tossed it straight to the net front and Rust tapped it past the sticks of Makar and Compher and past Toews - who was trying to defend the goal line - to tie the score 1-1 at 16:22.
In overtime, the Penguins had seemingly scored on a combo from Sidney Crosby to Letang as Francouz slid back into his crease. Upon review, it was deemed that the puck didn't cross the goal line and there was no goal.
The Avalanche then received a power play at 1:21 as Malkin was called for tripping, but Colorado's extra-man unit was unable to convert on the four-on-three.
Following the big penalty kill, the Penguins' three horsemen of Crosby, Malkin and Letang went to work. Letang curled around the net and centered the puck to the slot where Malkin paced it straight to Crosby. The Pittsburgh captain fired a shot on net, but Francouz made the stop and the rebound bounced out to the point where Letang corralled it and redirected it back on net. Frnacouz made another stop, but Malkin one-timed the rebound on net and a scrum ensued as bodies toppled over in the blue paint. Crosby secured possession of the puck, skated behind the net and sent a pass from the hash marks to the left faceoff circle for Letang to wire a sizzling wrister past Francouz to seal the two-point comeback victory for the Penguins.