Sur Ubuntu, si j'essaie de voir ce pdf: https://gradschool.princeton.edu/sites/gradschool/files/FPO_Examination_Report.pdf
Tout se passe bien sauf la deuxième ligne (celle qui contient "avoir soumis une thèse telle que rapportée précédemment"). Au début de cette ligne, avant la zone de texte, il y a juste un tas de caractères parasites qui se chevauchent.
Le problème semble être que la police Calibri n'est pas intégrée.
Voici quelques résultats qui pourraient être utiles:
$ pdffonts FPO_Examination_Report.pdf
name type encoding emb sub uni object ID
------------------------------------ ----------------- ---------------- --- --- --- ---------
Calibri CID TrueType Identity-H no no no 78 0
BUOFXG+Calibri CID TrueType Identity-H yes yes yes 83 0
HCQTDJ+Calibri TrueType WinAnsi yes yes yes 85 0
HCQTDJ+Calibri-Bold TrueType WinAnsi yes yes yes 87 0
HCQTDJ+Calibri-Italic TrueType WinAnsi yes yes yes 89 0
$ pdffonts -subst FPO_Examination_Report.pdf
name object ID substitute font substitute font file
------------------------------------ --------- ------------------------------------ ------------------------------------
Calibri 78 0 Carlito /usr/share/fonts/truetype/crosextra/Carlito-Regular.ttf
$
$ /usr/bin/gs \
> -o testing.pdf \
> -dPDFSETTINGS=/prepress \
> -sDEVICE=pdfwrite \
> FPO_Examination_Report.pdf
GPL Ghostscript 9.15 (2014-09-22)
Copyright (C) 2014 Artifex Software, Inc. All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
Processing pages 1 through 1.
Page 1
Can't find CID font "Calibri".
Attempting to substitute CID font /Adobe-Identity for /Calibri, see doc/Use.htm#CIDFontSubstitution.
The substitute CID font "Adobe-Identity" is not provided either. attempting to use fallback CIDFont.See doc/Use.htm#CIDFontSubstitution.
Loading a TT font from /usr/share/ghostscript/9.15/Resource/CIDFSubst/DroidSansFallback.ttf to emulate a CID font Adobe-Identity ... Done.
Can't find CMap Identity-UTF16-H building a CIDDecoding resource.
Warning: falling back to Identity ordering
Loading a TT font from /usr/share/ghostscript/9.15/Resource/CIDFSubst/DroidSansFallback.ttf to emulate a CID font CIDFallBack ... Done.
Can't find CMap Identity-UTF16-H building a CIDDecoding resource.
**** Warning: can't process font stream, loading font by the name.
Can't find CID font "Calibri".
Attempting to substitute CID font /Adobe-Identity for /Calibri, see doc/Use.htm#CIDFontSubstitution.
The substitute CID font "Adobe-Identity" is not provided either. attempting to use fallback CIDFont.See doc/Use.htm#CIDFontSubstitution.
Loading a TT font from /usr/share/ghostscript/9.15/Resource/CIDFSubst/DroidSansFallback.ttf to emulate a CID font Adobe-Identity ... Done.
Can't find CMap Identity-UTF16-H building a CIDDecoding resource.
Warning: falling back to Identity ordering
Loading a TT font from /usr/share/ghostscript/9.15/Resource/CIDFSubst/DroidSansFallback.ttf to emulate a CID font CIDFallBack ... Done.
Can't find CMap Identity-UTF16-H building a CIDDecoding resource.
**** Error reading a content stream. The page may be incomplete.
**** File did not complete the page properly and may be damaged.
**** This file had errors that were repaired or ignored.
**** The file was produced by:
**** >>>> Adobe PDF Library 9.0 <<<<
**** Please notify the author of the software that produced this
**** file that it does not conform to Adobe's published PDF
**** specification.
$