Refer to the JIRA
PDFBOX-2524 mentioned, pdfbox 2.0 still miss the update of "patching for built-in access to CJK fonts from Adobe Reader".
[PATCH] Two PDFont to create PDF documents in CJK and non-ISO-8859-1 languages:
Patches for other issues mentioned in JIRA
PDFBOX-2524 has already applied but for this issues. Up to now, I checked with latest version 2.0.4 and un-released version 2.0.5 / 2.1.0, but could not find any related patch (related source code like PDType0CJKFont.java, etc...).