How should PDF files be saved from Adobe Illustrator or Coreldraw?

EDOCBUILDER > eDocBuilder FAQs
Any other application that you are saving PDF files out of for use with eDocBuilder will have various versions that can be in use, and the applications can be quite different from version to version. Best thing to do is reference the software publisher's documentation for any processes like saving PDF files.
 
 
Illustrator Help / Creating Adobe PDF files
https://helpx.adobe.com/illustrator/using/creating-pdf-files.html