https://github.com/jakewins/findbtc
I deleted 26BTC a while back when reinstalling a laptop, because they were effectively worthless. A few years later, they weren't anymore, so I wrote this to get them back. As long as the file system isn't encrypted, it scans the raw bytes on the disk to find remnants of wallets. It also unzips compressed files it finds and does the same scanning in there.
> go install github.com/jakewins/findbtc
I'll update the readme!
If that's giving you trouble, I can cross compile it here and upload a binary to github for you if you tell me your OS and processor - although since this is potentially sensitive software, I'd advice building it from source
Basically, what is at that offset is (remnants of) a Berkeley DB file; you'll need manually do the forensic work to get the key out of it past that. Alternatively, there are services that will recover locked/corrupted wallet files I think, so you could extract a big blob around that byte offset and find someone that will do the forensic work for you.