1. create a word document with an image
2. embed this document on a confluence page
   1. the image is visible when browsing the page
3. export the confluence page (either word or pdf)
   1. the image is not visible in the export

there is a related issue CONF-25599 concerning only word exports.
Thus I assumed pdf export should actually work, but it does not.
Images generated by other plugins, like e.g. gliffy, are at least visible on the pdf exports (although word is not working either).

I also tried to include the image directly into the page (i.e. without wrapping it into a word document). In this case it is indeed visible on the pdf-export.

I attached a test document as well.