Cannot handle iref streams. The current implementation of PDFsharp cannot handle this PDF feature introduced with Acrobat 6. (in `PdfSharp')

Status changed to 'Confirmed' because the bug affects multiple users.

I think this is caused by a change to the pdf compression algorithm with Adobe 6+
There's something that may be a solution (requiring source changes) at
   http://forum.pdfsharp.net/viewtopic.php?f=2&t=693#p5855
but as I'm not a C#/Mono person I have no idea what it's doing.

This only happens with some PDFs. Attached is an example.

Here is the output when run from the command line:

[1 Debug 23:12:26.237] Loaded /path/to/file.pdf
[3 Warn 23:12:26.369] Caught an exception - PdfSharp.Pdf.IO.PdfReaderException: Cannot handle iref streams. The current implementation of PDFsharp cannot handle this PDF feature introduced with Acrobat 6. (in `PdfSharp')
  at PdfSharp.Pdf.IO.Parser.ReadXRefTableAndTrailer (PdfSharp.Pdf.PdfReferenceTable xrefTable) [0x00000] in <filename unknown>:0
  at PdfSharp.Pdf.IO.Parser.ReadTrailer () [0x00000] in <filename unknown>:0
  at PdfSharp.Pdf.IO.PdfReader.Open (System.IO.Stream stream, System.String password, PdfDocumentOpenMode openmode, PdfSharp.Pdf.IO.PdfPasswordProvider passwordProvider) [0x00000] in <filename unknown>:0
  at PdfSharp.Pdf.IO.PdfReader.Open (System.String path, System.String password, PdfDocumentOpenMode openmode, PdfSharp.Pdf.IO.PdfPasswordProvider provider) [0x00000] in <filename unknown>:0
  at PdfSharp.Pdf.IO.PdfReader.Open (System.String path, PdfDocumentOpenMode openmode, PdfSharp.Pdf.IO.PdfPasswordProvider provider) [0x00000] in <filename unknown>:0
  at PdfMod.Pdf.Document.Load (System.String uri, PdfSharp.Pdf.IO.PdfPasswordProvider passwordProvider, Boolean isAlreadyTmp) [0x00000] in <filename unknown>:0
  at PdfMod.Gui.Client+<LoadPath>c__AnonStorey10.<>m__1C () [0x00000] in <filename unknown>:0
[3 Error 23:12:26.371] Error Loading Document - There was an error loading /path/to/file.pdf

It looks like the upstream bug exists over at http://pdfsharp.codeplex.com/workitem/8466, but Launchpad won't let me add it.

would love to get the patched version as I actually can't print from evince...

I get the following error with my LaTeX documents:

[1 Debug 08:56:15.191] Starting PdfMod 0.9.1
[1 Debug 08:56:15.197] Initializing i18n catalog from /usr/share/locale/
[1 Debug 08:56:15.239] Loaded custom AccelMap from /home/max/.config/pdfmod/gtk_accel_map
[1 Debug 08:56:15.249] Cache directory set to /home/max/.cache/pdfmod

(PdfMod:4740): GLib-GObject-WARNING **: Attempt to add property __gtksharp_3_PdfMod_Gui_PageCell::page after class was initialised
[1 Debug 08:56:15.505] Loaded ./VirtualBox VMs/Shared Folder/Studium/Masterarbeit/temp/main.pdf
[3 Warn 08:56:15.558] Caught an exception - PdfSharp.Pdf.IO.PdfReaderException: Cannot handle iref streams. The current implementation of PDFsharp cannot handle this PDF feature introduced with Acrobat 6. (in `PdfSharp')
  at PdfSharp.Pdf.IO.Parser.ReadXRefTableAndTrailer (PdfSharp.Pdf.PdfReferenceTable xrefTable) [0x00000] in <filename unknown>:0
  at PdfSharp.Pdf.IO.Parser.ReadTrailer () [0x00000] in <filename unknown>:0
  at PdfSharp.Pdf.IO.PdfReader.Open (System.IO.Stream stream, System.String password, PdfDocumentOpenMode openmode, PdfSharp.Pdf.IO.PdfPasswordProvider passwordProvider) [0x00000] in <filename unknown>:0
  at PdfSharp.Pdf.IO.PdfReader.Open (System.String path, System.String password, PdfDocumentOpenMode openmode, PdfSharp.Pdf.IO.PdfPasswordProvider provider) [0x00000] in <filename unknown>:0
  at PdfSharp.Pdf.IO.PdfReader.Open (System.String path, PdfDocumentOpenMode openmode, PdfSharp.Pdf.IO.PdfPasswordProvider provider) [0x00000] in <filename unknown>:0
  at PdfMod.Pdf.Document.Load (System.String uri, PdfSharp.Pdf.IO.PdfPasswordProvider passwordProvider, Boolean isAlreadyTmp) [0x00000] in <filename unknown>:0
  at PdfMod.Gui.Client+<LoadPath>c__AnonStorey10.<>m__1C () [0x00000] in <filename unknown>:0
[3 Error 08:56:15.558] Error Loading Document - There was an error loading ***PATH TO DOCUMENT***

This stackoverflow question has a few answers that might help: http://stackoverflow.com/questions/12782295/does-pdf-file-contain-iref-stream