PDF outline not capturing Cyrillic text

[Peter Schaffter]

Greetings, all.

Source documents written in Cyrillic and processed with mom/pdfmom
break the PDF outline:

1. The text of titles and headings is not displayed in the outline.

2. If there are items where English is automatically part of the
   outline label (cover, title page), the label prints (minus the
   text), but the linking hierarchy fails with some viewers if there
   are intervening titles or headings, e.g.
     doc cover (Cyrillic)
     copyright notice (in English)
     table of contents (auto relocated)
     title page (Cyrillic)
     chapter title (Cyrillic)
     body text with Cyrillic headings
   With the above arrangement, the outline in okular and evince shows
   only
     Cover: (no text)
     Copyright:
     Title Page: (no text)
   In okular, clicking on Copyright takes you to the correct page,
   however in evince, clicking on Copyright takes you to the table
   of contents page.

At a guess, it looks as if gropdf or pdfmark isn't recognizing Cyrillic
characters as valid input for creating pdf bookmarks.  I'm at a
loss as to how to overcome this.  Ideas?

-- 
Peter Schaffter
https://www.schaffter.ca