There are a few ways to tell if your raw steak has gone bad. Pay attention to the following:
Odor: Fresh steak has a mild, slightly iron-like smell. If the steak emits a sour, fishy, or moldy odor, it has definitely gone bad.
Texture: Fresh steak should be firm to the touch. If your steak feels slimy, sticky, or excessively soft, (gross!) it's probably gone bad.
Expiration date: Always check the expiration or "best by" date on the packaging. Remember, this date is not a guarantee of freshness. But, with that said, it can help you gauge whether the steak is still safe to consume.
Mold: If you see any mold growth on the surface of the steak, throw it out!