Hi,
I have a problem with embedded fonts with spaces in their name.
In my case this is with Source Han Sans.
This is the desired output with SourceHanSans embedded:

<< /Type /Font
/Subtype /CIDFontType2
/BaseFont /Source#20Han#20Sans#20Bold
/CIDSystemInfo << /Registry (Adobe) /Ordering (Identity) /Supplement 0 >>
/FontDescriptor 13 0 R
/CIDToGIDMap /Identity
/DW 992 >>

But wkhtmltopdf creates following:

<< /Type /Font
/Subtype /CIDFontType2
/BaseFont /Source Han Sans Bold
/CIDSystemInfo << /Registry (Adobe) /Ordering (Identity) /Supplement 0 >>
/FontDescriptor 13 0 R
/CIDToGIDMap /Identity
/DW 992 >>

The poppler-utils pdffonts spits out a lot of Dictionary key must be a name object errors with the current output and the PDFViewers show blank screens.

If I manually escape that /BaseFont it works like a charm.