I'm having the exact same issue, hang-freeze during Package Document (Creating PDF)
In Design CC - Mac OS X 10.11.6 (15G1004)
Unlike your problem, my system won't save the PDF, it just freezes and dies.
You state InDesign CC, do you mean InDesign CC2015.4 (11.4.1)?
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Did you try to save as idml, open that idml and save as new indd, and than do package from the new indd?