I had an answer from the Adobe staff friend I contacted, and she has sent a message to another staff friend asking him to look into it. It is Sunday, so there is no way to know how soon anything can happen.
I am still hoping that one of our Turkish forum friends sees this thread.
One thing often tried first is to create a new document and File>Place the (PDF contents, if any, of the) corrupted one to see how much may be rescued that way.
Here are some websites where you can see whether it can rescue the actual file, and if it can, you may pay for a subscription to have it done,