Post the crash report on Pastebin.com (not here) and give us a link to it, but I'll bet even without seeing it that it's a font problem. Start by installing the patch for CC at Crash | Launch, selecting Type tool and then if that doesn't solve the problem you should see Troubleshoot fonts | Mac OS X
I installed the patch, selected the type tool, but this did not trigger the problem. Opening the same file did.
Here is the crash report: http://pastebin.com/embed.php?i=cVPTQDSR
I had to induce it as the program only hanged, not crashed.
I have not yet troubleshooted the fonts.
Thank you so far, I will try the fonts next.
I don't recognize the cause from that, though I still think it's font-related.
Can your friend export to .idml, and will that open for you?