https://bugs.winehq.org/show_bug.cgi?id=40377
--- Comment #6 from Rosanne DiMesio dimesio@earthlink.net --- (In reply to hl w from comment #0)
Moreover, when I enter a math equation in Word. I can't see the equations in the exported PDF.
After a little more testing, I think that is a separate bug. When I save your sample docx file as a PDF in Word 2007 (wine-1.9.6, no native dlls other than riched20), the fonts aren't embedded, but the equation IS visible in the PDF.
So something else is going wrong with the way Word 2010 exports PDFs, but I'm not sure it's entirely a Wine bug. I also tested exporting a document with the "Binomial Theorem" built-in equation in Word 2010 running in Windows XP. In the resulting PDF, the parentheses and sigma symbol were missing, and while the letters and numbers were all there, they had been converted from Cambria Math to Calibri, and that was the only font that was embedded.
Googling, I also found http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1101&context=i..., which indicates Word 2010 not being able to embed some fonts in PDFs is a known issue.