Immortality / Resurrection - Jason could not be stopped, no matter what the circumstances. Even if he appears to be "dead", he always finds a way to return through means of resurrection.
Regeneration - Jason possessed a unique ability to regenerate lost and damaged tissue at an accelerated rate. As a result, he could sustain bullet and knife wounds and be virtually unaffected.
Super Strength - Jason had super physical strength that a human would not be able to achieve. This includes, but is not limited to, going through solid concrete, crushing a person's skull with his bare hands, decapitating someone with a simple punch, and being able to free himself when he was pinned to the ground by a fallen tree. He also got stronger each time he was resurrected.
Invulnerability - In addition to his accelerated healing, his skin was very tough, that further protects him effectively from every kind of attack. He also has a high pain tolerance due to the fact that he's really silent and shows no pain when he receives a variety of damages, blows, wounds or fatal injuries.
Horror Master - Since the Horror Master conjurate him, he could un-conjurate him. Even the Horror Master's death would make him not exist anymore.