What kind of PDF files that MMA does not read (import)

I can confirm that neither Mathematica 10, nor Mathematica 9 will import this file. Your installation is not broken.

There is (very likely) nothing you can do to make Mathematica read this file. Your best best is transforming the PDF without changing it visually, then trying to import it again. There are many programs that can do this, including Adobe Acrobat, Ghostscript (pdfopt?), OS X Preview, Multivalent, etc.

I tried File -> Export as PDF… from OS X Preview and the result can be read with Mathematica (though the colours are lost upon import).

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