With the older versions of Acrobat Reader to view a document that had both english and japanese fonts you had to install an extra font pack for the language that the additional fonts used. With Reader X I see there is a MUI for the Japanese version but I am using the english (US) version and want to view PDF files that have japanese fonts. Do I need to install additional font pack? If so where do I download it? If not how do I configure the reader app to view the fonts?
Assuming that you have installed Reader MUI on an English OS, you will need to install the additional Japanese Font Pack to view any Japanese PDF (From the location mentioned in ssway's post). Reader MUI simplifies the process of installing different language versions of Reader by providing you with a single installer for the same.
The below link sheds more information on the same:
Hope this helps
If Adobe Reader X MUI is installed on a Japanese OS do you need to install the Japanese fonts for any reason?