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c# - 'PDFsharp cannot handle this PDF feature introduced with Acrobat 6' error while opening PDF file

I use PDFsharp (v1.32) for merging several PDF files. I open documents using this code:

PdfDocument inputDocument = PdfReader.Open(pdfFilePath, PdfDocumentOpenMode.Import);

And while opening one document (with PDF version 1.5 (Acrobat 6.x)) I receive an exception:

An unhandled exception of type 'PdfSharp.Pdf.IO.PdfReaderException' occurred in PdfSharp.dll Additional information: Cannot handle iref streams. The current implementation of PDFsharp cannot handle this PDF feature introduced with Acrobat 6.

What can I do with it? I need to merge all files, I cannot just skip it. I tried to find solution, but found not answered or just very old feedback from PDFsharp Team that they are going to "fix it".

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