PDFs rendering stretched in iOS 8

I went to my company's website and launched a few PDFs from my iPhone and iPad (both on iOS 8) while using Safari and noticed that copy, images and logos are displaying vertically stretched out in the PDF. I'd never experienced this before on previous iOS versions so I'm curious if there's a PDF encoding issue we need to address that plays nice with iOS 8. Any thoughts?

Other examples are:
http://www.tezuka-i-h.jp/temp/2013examination/2013Enyusi-kekka.pdf
http://dressmwforsuccess.com/investor_presentation_nov2013.pdf
http://cfassociates.samuraiz.co.jp/default/assets/File/CF_10_license_price.pdf
http://www.hitachi-solutions.co.jp/pdf/client_management01.pdf
http://www.comdesign.co.jp/pdf/ct-e1saas_price.pdf
http://labs.appligent.com/files/2013/03/recognizing_malformed_pdf_f.pdf
http://fordy.jp/products/file/20131219120808.pdf
>What is a rotation flag?
It is difficult to explain it if you do not have a programmatic knowledge about the structure of PDF.
But maybe "PageRotation" is the exact English word. I am sorry for my poor English.
cf.
http://www.debenu.com/docs/pdf_library_reference/PageRotation.php
https://pspdfkit.com/api/Classes/PSPDFPageInfo.html
http://search.cpan.org/dist/PDF/PDF/Parse.pm
If PageRotation is not 0 but 90 or something, it seeems, the problem occurs in the case of Safari in iOS 8.0.

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