AEM's PDF generation fails for unicode languages like Chinese and Japanese.
Cause
The FOP configuration is to be updated and extra fonts to be added in AEM to support foreign languages that use unicode.
Resolution
Go to http://host:port/crx/de/index.jsp and log in as admin.
Create a fonts folder under /libs/wcm/core/content/pdf. Then create a config under this path /libs/wcm/core/content/pdf/fonts/foconfig.xml based on the conf/fop.xconf mentioned in article [1].
Then upload fonts to that folder using curl. For example: