var fileTxt =
System.IO.File.ReadAllText(@"K:\SOMEFILE.TXT",
Encoding.UTF8);



// Set font encoding to unicode
XPdfFontOptions options = new XPdfFontOptions(PdfFontEncoding.Unicode);
XFont font = new XFont("Courier New", 6, XFontStyle.Regular, options);


// Create new document
PdfDocument document = new PdfDocument();
PdfPage page = document.AddPage();

XGraphics gfx = XGraphics.FromPdfPage(page);


XTextFormatter tf = new XTextFormatter(gfx);
tf.Alignment = XParagraphAlignment.Left;

tf.DrawString(fileTxt, font, XBrushes.Black,
new XRect(20, 20, page.Width-20, 300), XStringFormats.TopLeft);