Extract particular text below an image from PDF

You can use  .NET pdf component to accomplish your task, here is the code

       StringBuilder buffer = new StringBuilder();
            IList images = new List();

            foreach (PdfPageBase page in doc.Pages)
            {
                buffer.Append(page.ExtractText());
                foreach (System.Drawing.Image image in page.ExtractImages())
                {
                    images.Add(image);
                }
            }

            doc.Close();
            //save text
            String fileName = "TextInPdf.txt";
            File.WriteAllText(fileName, buffer.ToString());

            //save image
            int index = 0;
            foreach (System.Drawing.Image image in images)
            {
                String imageFileName
                    = String.Format("Image-{0}.png", index++);
                image.Save(imageFileName, ImageFormat.Png);
            }