PDF rendering bug in OS X and iOS I received a PDF by e-mail which is unreadable on my Mac (Lion 10.7.3) and on my iPhone (iOS 5.1.1) but the same PDF renders perfectly on Windows. If I use Chrome on my Mac, (which has its own built in PDF renderer and doesn't use the OS X one), it renders correctly as well. So far it's the only PDF I've ever encountered with the problem, but others are having similar problems.

I've attached a screenshot of the rendering problem, which is best described as rendering most text as a series of grayscale stepped gradients. Note that the grayscale 'bars' don't correspond directly to the missing lines of text. There's much more text than that.

Anyone have any ideas?
The issue would appear to be the font used for the text, a font called "Corbel"; it is a Windows only font created by MS and included in all version of Windows Vista and above.

Normally, PDF's can be created with embedded fonts, in this case the font is not fully embedded, only a subset (e.g. those characters required for the docuemnt)

Further research shows that there are a lot of issues with Macs reading PDF's created with Word 2007

Note, Chrome includes a copy of those fonts as part of it's PDF rendering engine.