While extracting text from PDF unable to extract urdu text

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C#

i am extracting text from PDF it has English and Urdu text , English text extracted as expected but ItextSharp library convert Urdu text into special characters kindly guide me

What I have tried:

PdfReader reader = new PdfReader(pdfpath);

int pageNum = reader.NumberOfPages;


for (int i = 177; i <= pageNum; i++)
{
// this line convert urdu into special character
text = PdfTextExtractor.GetTextFromPage(reader, i, new LocationTextExtractionStrategy());




}