The following code only extracts text if that is what you are looking for.
PdfReader pdfReader = new PdfReader(documentPath);
ITextExtractionStrategy its = new iTextSharp.text.pdf.parser.SimpleTextExtractionStrategy();
string txt = PdfTextExtractor.GetTextFromPage(pdfReader, page, its);
extractedText = Encoding.UTF8.GetString(ASCIIEncoding.Convert(Encoding.Default, Encoding.UTF8, Encoding.Default.GetBytes(txt)));
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