Adobe once offered a free "Font Pack" for Asian languages, which included standard CID fonts. While discontinued, you can find archived copies on (still active for legacy support):
/F1 << /Type /Font /FileType /TrueType /Path (/usr/share/fonts/NotoSansCJK-Regular.ttc) /SubfontID 0 /CSI [(Japan1) 1] >> ; /F2 << /Type /Font /FileType /TrueType /Path (/usr/share/fonts/NotoSansCJK-Regular.ttc) /SubfontID 1 /CSI [(Korea1) 1] >> ; cid font f1 f2 f3 f4 f5 f6 f7 fonts free download new