Flyers forward Garnet Hathaway left the game at 10:15, being helped to the locker room after a hit from Penguins forward Bokondji Imama. No update was provided.
Imama was called for interference, and Michkov scored on the ensuing power play, making it 4-2 at 11:05 with a wrist shot from the left face-off circle.
“It was hard to refocus again,” Michkov said. “I think we came back and scored on the power play. ... Garnet means a lot to the team. It’s a big loss.”
Karlsson cut it to 4-3 at 18:17 on a snap shot from the right circle before Malkin tied it 4-4 at 2:30 of the third period, drifting into the left circle for a snap shot.
“It means a lot for the whole team,” Blomqvist said. “Today wasn't pretty but we found a way. I give the group a lot of credit for it."
NOTES: Pittsburgh center Sidney Crosby, who had an assist, and Malkin became the first duo in NHL history to have 400 wins in games where they both had at least one point. ... Penguins forward Michael Bunting was placed on injured reserve. He is out indefinitely after having surgery Wednesday to remove his appendix. ... Pittsburgh forward Noel Acciari had one shot on goal in 12:32 of ice time in his 500th NHL game. ... Michkov had his third three-point game, tying Matt Read (2011-12) for the most by a Flyers rookie in a season in the past 30 years. He had three points in a period for the second time, tying Mikael Renberg, Al Hill, Brian Propp and Read for the most instances in Philadelphia history by a rookie.