Read javascript from pdf using iTextSharp

Question

I have a script that runs after the pdf-file has been loaded and that populates some form fields in the pdf. I assume it is some kind of javascript running behind the scene. In the javascript code some values are stored that I need to retrieve. I use iTextSharp to work with the pdf-file. Is it possible to read the javascript code or the values so I can work with them in my c# code somehow?

Community · Accepted Answer · 2017-05-23 12:12:43Z

1

Modified from this SO answer:

var pdfReader = new PdfReader(infilename);
using (MemoryStream memoryStream = new MemoryStream())
{
    PdfStamper stamper = new PdfStamper(pdfReader, memoryStream);
    for (int i = 0; i <= pdfReader.XrefSize; i++)
    {
        PdfDictionary pd = pdfReader.GetPdfObject(i) as PdfDictionary;
        if (pd != null)
        {
            PdfObject poAA = pd.Get(PdfName.AA); //Gets automatic execution objects
            PdfObject poJS = pd.Get(PdfName.JS); // Gets javascript objects
            PdfObject poJavaScript = pd.Get(PdfName.JAVASCRIPT); // Gets other javascript objects
            //use poJS.GetBytes(), poJS.ToString() etc to inspect details...
        }
    }
    stamper.Close();
    pdfReader.Close();
    File.WriteAllBytes(rawfile, memoryStream.ToArray());
}

Here's a reference page for the PdfObject class.

edited May 23, 2017 at 12:12

CommunityBot

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answered Nov 27, 2013 at 14:01

Sven Grosen

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2 Comments

Janspeed Over a year ago

Thanks! This works although I found no values. I think it might be in a fdf file. But I have no idea where in the pdf file the path to the fdf file is stored and how to access it? The answer is correct so I will mark it as an answer but it seems it's not the answer I need :)

mkl Over a year ago

@Janspeed can you post the pdf for inspection?

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