When viewed inside Acrobat Reader, the document is rendered correctly (see attached image "acrobat.png").
When the same pdf is viewed inside Chrome (version 70.0.3538.102) or Firefox (version 60.0.3) fonts are not even readable, and rendered totally wrong (see attached images "chrome.png" and "firefox.png").
This behavior truly limits fonts used inside pdf.
I've also attached both the pdf and the original docx file used for the tests.
Greetings from Syncfusion.
We can reproduce the reported issue from our side. This issue has been fixed recently and the issue fix will be included in our upcoming main release 2018 Volume 4. The release is estimated to be rolled out by December 2018 and we will let you know once it is released. So, we recommend you to upgrade to 2018 Volume 4 Essential version which will resolve this issue.