Missing text and images from PDF files

I recently came across two papers that are missing images or the entire text even though the original file contains this information. I tried opening the files and resaving them and even tried various methods for compression with no luck.

This paper is missing an image
https://s3.amazonaws.com/zotero.org/images/forums/u9824633/aioi7tzgrfmhscig4jr1.png Import in Zotero

https://s3.amazonaws.com/zotero.org/images/forums/u9824633/m07con8geqt19bdzfc7i.png Original PDF

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This paper is missing all text. I have tried various methods of resaving.
https://s3.amazonaws.com/zotero.org/images/forums/u9824633/1o9jkgvreyrbpt42h6dw.png Import in Zotero

https://s3.amazonaws.com/zotero.org/images/forums/u9824633/ahkcoai31pw6lnsepr43.png Original PDF

Is there a type of PDF file which causes this?
Have others seen this?
Is there a solution?
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