It seems that old Adobe Freehand drawings (.fh11 files for example) were notoriously difficult to properly export to PDF and some elements may have not been saved completely and hence a lot of people are looking for a way to achieve fh11 to pdf conversion. Some users circumvent this situation successfully by exporting to EPS format (PostScript) instead and then import this to some graphics editor like Fireworks or Photoshop and export that to PDF.
Open FH11 file Open PDF file