var pdfReader = new PdfReader(pdfFile);
for (var pageNumber = 1; pageNumber <= pdfReader.NumberOfPages; pageNumber++)
  {
      var pdf = new PdfReader(pdfFile);
      var pg = pdf.GetPageN(pageNumber);
       // process page
  }

var pdf = new PdfReader(pdfFile);
var pg = pdf.GetPageN(pageNumber);
var res = (PdfDictionary)PdfReader.GetPdfObject(pg.Get(PdfName.RESOURCES));
var xobj = (PdfDictionary)PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT));
if (xobj == null) continue;
foreach (var name in xobj.Keys)
 {
    var obj = xobj.Get(name);
     if (obj.IsIndirect())
    {
        // process obj ...
    }
}

var tg = (PdfDictionary)PdfReader.GetPdfObject(obj);
var width = tg.Get(PdfName.WIDTH).ToString();
var height = tg.Get(PdfName.HEIGHT).ToString();
ImageRenderInfo  imgRi = ImageRenderInfo.CreateForXObject(new Matrix(float.Parse(width), float.Parse(height)), (PRIndirectReference)obj, tg);

private  void RenderImage(ImageRenderInfo renderInfo, string imgPath)
    {
            var image = renderInfo.GetImage();
            using (var dotnetImg = image.GetDrawingImage())
            {
                if (dotnetImg == null) return;

                using (var ms = new MemoryStream())
                {
                    dotnetImg.Save(ms, ImageFormat.Jpeg);
                    var d = new Bitmap(dotnetImg);
                    d.Save(imgPath);
               }
       }
 }

private void ExtractImage(string pdfFile, string imgPath)
{
    var fileCounter = 0;
    var pdfReader = new PdfReader(pdfFile);
    for (var pageNumber = 1; pageNumber <= pdfReader.NumberOfPages; pageNumber++)
    {
        var pdf = new PdfReader(pdfFile);
        var pg = pdf.GetPageN(pageNumber);
        var res = (PdfDictionary)PdfReader.GetPdfObject(pg.Get(PdfName.RESOURCES));
        var xobj = (PdfDictionary)PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT));
        if (xobj == null) continue;
            foreach (var name in xobj.Keys)
            {
                var obj = xobj.Get(name);
                if (obj.IsIndirect())
                {
                    var tg = (PdfDictionary)PdfReader.GetPdfObject(obj);
                    var width = tg.Get(PdfName.WIDTH).ToString();
                    var height = tg.Get(PdfName.HEIGHT).ToString();
                    var imgRi = ImageRenderInfo.CreateForXObject(new Matrix(float.Parse(width), float.Parse(height)), (PRIndirectReference)obj, tg);
                    fileCounter++;
                    RenderImage(imgRi, imgPath + fileCounter + ".jpeg");
                }
            }
    }
}

var path = @"C:\";
var fileName = "1.pdf";

var outPath = path + fileName + @"_extractedImgs\";
Directory.CreateDirectory(outPath);

ExtractImage(path + fileName, outPath);