...there have never been any attacks by Bigfoot on humans. With that said, there is the account of Ape Canyon and the Ostman incident, both can be researched on the net. However, no attacks by Bigfoot have ever been documented.
There are several accounts where a critter may have bluff charged a person, or chased them but we have no evidence of an out-right "attack."
This doesn't mean they wouldn't, couldn't or can't attack a person, and there are those who wonder if some of the hiker/camper "missing" reports may have been attacks. We simply don't know.
As with any wild animal, prudence is a must. Be cautious when in the woods.