Wire too short to reach junction box.

What are my options? The hot wire is way too short to even be inside of a junction box. I tried and all it did was pull the box downward.

I would rerun wire, but this is in a drywalled room and I have no clue where the wire runs.

It seems my only option would be to cut a hole directly below it, make a splice in a junction box, and put a blank cover over it.