Maybe...
Under certain circumstances...possible. The hammer would almost have to be
off the firing pin stop and the spring would have to be seriously weak...and the blow would have to be heavy for it to happen though.
Some mainspring housings are slightly out of spec, and dont allow for full forward hammer travel...or the hammer strut is bit short, and the hammer doesn't come to full rest on the stop...or even has a little play. If the hammer isn't touching the firing pin, or is just barely touching it...it's slightly possible that a hard blow to the hammer could drive it forward with enough force to overcome the firing pin spring and let the tip of the pin light a sensitive primer...such as a round of Federal ammo...known to have primers that are a little touchy.
I've run into tolerance stack issues that prevent full hammer travel, and actually leave the hammer flopping when fully down. If the housing is located
a little low in the grip frame...and the cap itself is a little too tall with its travel limited by hitting the cap retaining pin...which may also be located slightly low...AND the strut is on the short side of tolerance...all these little things stack up the wrong way and you can have a hammer that sits as much as .050 inch off the firing pin stop. In a case like this, a strong blow to the hammer could conceiveably fire the gun, especially if the firing pin spring is also weak or on the short side of spec.
Note that these dimensions can be within acceptable tolerance, but when they all come together in the same pistol, they add up to the whole system
being out of spec.
So...Yes. It could happen, though the chances would be low. "Course...
people get bitten by sharks and hit by lightening and even win the lottery
sometimes...