If you can't run checkDB, then there's going to be no way to repair this database (as checkDB is the thing that does the repair). Since you have no good backup (why not?) your options are pretty slim

Extract the data that you can, script the objects, drop the database and recreate.

Why are there no backups? I hope the same does not go for the other 800+ databases. Have you done consistency checks on all the others? It is a good idea. Also, do some checks of the IO subsystem as that is the likely cause. That you could move the file and still have the corruption does not rule out the IO subsystem. From the error, it looks like a portion of the file was zeroed out. (overwritten with 0).