Strange letters occurs when opening pdf file

I put some pdf files in the ‘media’ menu. And I put the link in some posts so I can download these files.
But when I open the pdf files with this link, the title changes strangely.
(like this. ø¬µµºæº≠≥ª¡ˆpdføÎ)

At first, I thought it was because I used Korean. So I changed the title of the file to English and then uploaded it again, but it’s the same situation.

Googling, I also tried setting utf 8 in .htaccess but it still didn’t solve the problem (My mysql is utf8mb4)

If you have experienced symptoms similar to me and have resolved them, could you tell me how you took action?

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