Issue with arabic language using itextsharp vb.net

I am using iTextSharp to convert HTML to pdf that has arabic and english characters,. I was able to show the English characters, but no luck with the arabic ones. I am using below code

Code:

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        Dim bf As BaseFont = BaseFont.CreateFont("c:\windows\fonts\arial.ttf", BaseFont.IDENTITY_H, True)
        Using sw As StringWriter = New StringWriter()
            Using hw As HtmlTextWriter = New HtmlTextWriter(sw)
                Me.Page.RenderControl(hw)
                Dim sr As StringReader = New StringReader(sw.ToString())
                Dim pdfDoc As Document = New Document(PageSize.A4, 10.0F, 10.0F, 10.0F, 0.0F)
                Dim writer As PdfWriter = PdfWriter.GetInstance(pdfDoc, Response.OutputStream)
                pdfDoc.Open()
                Dim font As New iTextSharp.text.Font(bf, 10, iTextSharp.text.Font.NORMAL)
                XMLWorkerHelper.GetInstance().ParseXHtml(writer, pdfDoc, sr)
                pdfDoc.Close()
                Response.Cache.SetCacheability(HttpCacheability.NoCache)
                Response.Write(pdfDoc)
                Response.End()
            End Using
        End Using

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Seems you need Arial Unicode, instead of basic Arial?