Cannot open pdf files

[DavidP1568]

I have 30 something pdfs on a usb drive that I can't open. It gives me this message. I have the need to open all of them but they all give me this message. I am using Adobe Acrobat XI standard.  I would appreciate any insights. It will not let me attach one of the many pdfs.I appreciate it in advance, Thank you.

When I try to open it in Adobe Acrobat Reader DC, it gives me this error:

When I try to attach it, it gives me this error:

[Bernd Alheit]

Open one file in a text editor like Notepad. What can you see there?

[DavidP1568]

I see a bunch of letters and symbols.

[Bernd Alheit]

What can you see at the first lines?

[DavidP1568]

SCDSA002 Ð =”äs+´b<.ìñà2ºÑ¤ü"ƒGÓY*aŸg"~Éy>B¨Qt

[Bernd Alheit]

This is not a valid PDF file.

[Amal.]

Hi there

Hope you are doing well and sorry for the trouble. As described you are unable to open the PDF file and getting the error 'the file is damaged'

There can be many reason of PDF file corruption such as Sudden power failure, viruses, Improper Downloading, System malfunction or incorrect creation process.

Please check out the steps shared in the help page Resolve damaged document error when opening PDF files and see if that works for you.

Note: Adobe Acrobat XI is an EOL application https://helpx.adobe.com/acrobat/kb/end-of-support-acrobat-xi-reader-xi.html

Regards

Amal

[Amal.]

Hi there

Hope you are doing well and sorry for the trouble. As described you are unable to open the PDF file and getting the error 'the file is damaged'

There can be many reason of PDF file corruption such as Sudden power failure, viruses, Improper Downloading, System malfunction or incorrect creation process.

Please check out the steps shared in the help page Resolve damaged document error when opening PDF files and see if that works for you.

Note: Adobe Acrobat XI is an EOL application https://helpx.adobe.com/acrobat/kb/end-of-support-acrobat-xi-reader-xi.html

Regards

Amal