Thank you for writing back with that information.
I believe the password ***** asked for in the attached PDF file (the file is in PDF format that opens in Adobe Reader) is a password ***** or PROVIDED by the creator or sender of the PDF document. This is common to PDF files that are invoices or statements of account in various services. They are called password-protected PDF files to provide a second layer of security for the sensitive information found in the document.
So to answer your question, the password ***** asked for in this PDF file is only particular to this PDF file. Please check the actual email since in the footer of such emails, you may find some valuable information as to the PATTERN for such passwords.
For instance, it could be your date of birth followed by your account number. If you cannot find such information in the email itself, please contact the company who sent you the email so that they can tell you the password ***** their password-protected PDF files.
In normal circumstances, you can open Adobe Acrobat or Adobe Reader without the need of a password. So if you are prompted for a password, it is NOT to open Adobe Acrobat or Adobe Reader -- it is the password ***** the specific PDF file that you want to open, or the so-called password-protected PDF files.
I also receive some password-protected PDF files for my credit card bills and in the email message there they provide some guide as to the password ***** open the PDF file. But yours might be different so please check the email message accompanying the attachment or contact the company who sent you the password-protected PDF file.
Please check my screen shot in this link:
I hope that helped.
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