Incorrectly Decoded .pdf

There is a pdf file that is being sent to many employees via email attachment, and 99% of them can open them up from a variety of different phones. A handful are getting the error of "Adobe Reader could not open because not supported or has been damaged(if email it was'nt correctly decoded)"
I have read many forum responses from others with the same problem, but I have a question that might help narrow this down for me.
If I open the pdf in notepad and it looks like chinese...what does that mean?
倥䙄ㄭ㜮ਠ쿣⃓ㄊ〠漠橢ਠ㰼ਠ启灹⁥䌯瑡污杯ਠ倯条獥㈠〠删ਠ倯条䵥摯⁥唯敳潎敮ਠ嘯敩敷偲敲敦敲据獥㰠‼⼊楆坴湩潤
Thanks

You don't open PDF files with Notepad, but with Adobe Reader. Notepad can only open text files.
Sending encoded documents via e-mail is never a good idea. Upload the document to a server (using a service like https://sendnow.acrobat.com/), then send the link in the e-mail message.

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