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The Orlan space suits are semi rigid with a solid torso and flexible arms and legs. They (the previous models) have been used for space walks in Earth orbit with success from 1985 until now.
Their legs may be moved a little in zero gravity, but would it be possible to walk with them on the moon for some hours? The mobility of the hip joints seems to be very limited as they are within the rigid part of the suit. If the wearer may move his thighs only very little, walking will be difficult.
It would certainly be possible, the environment of the moon's surface is not that different from orbit, you have the same temperature differences, so an astronaut (more likely cosmonaut) could survive. If you look at the Apollo footage astronauts weren't bending down and walking around, the used tools to reach the surface and hopped around due to the lack of suit mobility.
The Orlan suit is a development from the Kretchet suit, which was developed for the Soviet moon program, and they are extremely similar.
Here's the Ketchet on the left and the Orlan on the right:
Given the similarity in design it's safe to say the Orlan could be used on the moon.
One big concern would be contact with the lunar surface, you'd need to protect the cosmonaut's feet from sharp rocks and cold from the surface, the Apollo suits had overboots with reinforcing and extra insulation for that purpose. There's no reason you couldn't use the same approach with an Orlan suit, or use the same boots developed for the Kretchet suit.
