Scores exported as PDFs look terrible on Mac

A bandmate who has used both WIndows and Linux (Ubuntu, I think?) sends out PDFs of sheet music he does in Muse Score. When I view them on my Mac (currently running High Sierra) in Preview (the Mac PDF reader), they've always looked really bad (see attached example). However, they look fine in Adobe Acrobat. I suspect that it has something to do with fonts. Acrobat indicates embedded TrueType (CID) fonts with identity-H encoding. What I can suggest to my colleague so that the PDFs he provides look decent in Preview? I've never had any other issues viewing PDFs in Preview, whether they are sent by Windows or Mac users.