If it is "en_US", edit /lib/cffont.properties. Otherwise, create a /lib/cffont.properties.#locale#(e.g. /lib/cffont.properties.zh_TW ) using cffont.properties as reference.
Replace the font(s) after '=' with system's Chinese font (e.g. MingLiu) for Chinese or system's Japanese font (e.g. MS UI Gothic) for Japanese respectively, assuming ColdFusion is installed on Windows, and client has the respective font(s) installed.
Restart ColdFusion, and then the font should show up correctly...
p.s. In Report Builder
Now with the PDF open, Right-click -> Document Properties... , you should see the specified font in the cffont properties file.
Hmm... now why can't PDF support UTF-8 correctly is beyond me... How to display both Chinese and Japanese and Korean in the same PDF? I don't know.
If you know which Chinese / Japanese / Korean fonts are installed by Adobe Reader language pack, please let me know here: http://stackoverflow.com/questions/3474221/which-fonts-are-installed-by-adobe-reader-asian-and-extended-language-font-packs
If you have a better method of getting cfreport / cfdocument render Chinese / Japanese / Korean, please share in Comments!
Thank you
update: if you don't need PDF, format="flashpaper" just works. Thanks Macromedia!