path = System.IO.Path.Combine(Application.streamingAssetsPath, "test.pdf");

  IEnumerator request()
    {
        UnityWebRequest www = UnityWebRequest.Get(path);
        yield return www.SendWebRequest();
        if (www.isNetworkError || www.isHttpError)
        {
            Debug.Log(www.error);
        }
        else
        {
            print(www.downloadHandler.data.Length);
            mm = new MemoryStream(www.downloadHandler.data);
            PdfReader reader = new PdfReader(mm);
            ITextExtractionStrategy strategy;
            testText.text = "IN";

            Rectangle rect = new Rectangle(45, 0, 135, 150);
            RenderFilter filter = new RegionTextRenderFilter(rect);
            int q;
            for (int i = 1; i <= reader.NumberOfPages; i++)
            {
                strategy = new FilteredTextRenderListener(new SimpleTextExtractionStrategy(), filter);
                print(PdfTextExtractor.GetTextFromPage(reader, i, strategy));
                testText.text = PdfTextExtractor.GetTextFromPage(reader, 1, strategy);

            }
            mm.Close();
        }
    }