How to open password protected PDF file?

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This might be helpful. Why don’t you give it a try:

How To Remove A Password From A PDF File With Third-Party Tool | PDF Password Remover Tools!

Some PDFs are encrypted with a password, which you’ll need to enter each time you want to view the document. You can remove the password to save yourself some inconvenience if you’re keeping the PDF in a secure location. We’ll cover two ways to do this here: A convenient trick that works in all operating systems with applications you already have, and the official method that requires Adobe Acrobat. Both methods assume you know the password to the encrypted PDF file. Unfortunately, there’s no e…