How do I open a document that requires a password when I didn't set a password
Its the last 4 of your social
I hope you are doing well, and I am sorry to hear that.
Have you created this file or got it from a different user? If you have received the file from another user, please get in touch with the sender/owner of the PDF to get the password.
If you are the PDF owner, please recreate the PDF file from the source file.