prawn：Prawn::Font::TTF::UNICODE_CMAP_TEMPLATE

everyday Ruby 
#!/usr/bin/env ruby

require "prawn"

pdf = Prawn::Document.new
p Prawn::Font::TTF::UNICODE_CMAP_TEMPLATE

で、

"/CIDInit /ProcSet findresource begin\n12 dict begin\nbegincmap\n/CIDSystemInfo <<\n/Registry (Adobe)\n/Ordering (UCS)\n/Supplement 0\n>> def\n/CMapName /Adobe-Identity-UCS def\n/CMapType 2 def\n1 begincodespacerange\n<00><ff>\nendcodespacerange\n%s\nendcmap\nCMapName currentdict /CMap defineresource pop\nend\nend"