I hv forget my password for opening pdf file

The idea behind a PDF password is to provide at least some security to your PDF file. If you have forgotten a password that you yourself applied to a PDF file, unless you saved a copy of that password someplace else or let someone else (you trust) know what that password is, there is no way of Adobe or any of the participants in this community to somehow send you the password. And certainly, Adobe doesn't somehow secretly keep a copy of passwords that you apply to PDF files. Nor is there any way to reset a PDF file's password if you don't know the current password.

Sorry, we can't assist you here.