iTextSharp library does not extract text from my file

Question

iTextSharp library (version 5.5.5) does not extract text from my file. I can copy and paste text from pdf into Notepad. I uploaded file to this link.

The source code

Answer 1

I have addition to the answer given by @mkl. Here is how to notify iTextSharp that Asian dlls are in the project. You need to add static constructor of yours text extraction class:

static PdfDocument()
{
    iTextSharp.text.io.StreamUtil.AddToResourceSearch("iTextAsian.dll");    
    iTextSharp.text.io.StreamUtil.AddToResourceSearch("iTextAsianCmaps.dll");
}