public void RemoveDocumentJavascript(Stream inputStream, Stream outputStream)
{
    PdfFixedDocument doc = new PdfFixedDocument(inputStream);
    // Remove document level JS code
    doc.JavaScriptBlocks.Clear();

    RemoveDocumentActions(doc);

    // Remove JavaScript from annotations.
    for (int i = 0; i < doc.Pages.Count; i++)
    {
        for (int j = 0; j < doc.Pages[i].Annotations.Count; j++)
        {
            RemoveAnnotationActions(doc.Pages[i].Annotations[j]);
        }
    }

    // Remove Javascript from fields
    for (int i = 0; i < doc.Form.Fields.Count; i++)
    {
        RemoveFieldActions(doc.Form.Fields[i]);
    }

    doc.Save(outputStream);
}

private void RemoveDocumentActions(PdfFixedDocument doc)
{
    if (doc.OpenAction is PdfJavaScriptAction)
    {
        doc.OpenAction = null;
    }
    if (doc.BeforeCloseAction is PdfJavaScriptAction)
    {
        doc.BeforeCloseAction = null;
    }
    if (doc.BeforeSaveAction is PdfJavaScriptAction)
    {
        doc.BeforeSaveAction = null;
    }
    if (doc.AfterSaveAction is PdfJavaScriptAction)
    {
        doc.AfterSaveAction = null;
    }
    if (doc.BeforeSaveAction is PdfJavaScriptAction)
    {
        doc.BeforeSaveAction = null;
    }
    if (doc.AfterSaveAction is PdfJavaScriptAction)
    {
        doc.AfterSaveAction = null;
    }
    if (doc.BeforePrintAction is PdfJavaScriptAction)
    {
        doc.BeforePrintAction = null;
    }
    if (doc.AfterPrintAction is PdfJavaScriptAction)
    {
        doc.AfterPrintAction = null;
    }
}

private void RemoveAnnotationActions(PdfAnnotation annotation)
{
    if (annotation.PageOpen is PdfJavaScriptAction)
    {
        annotation.PageOpen = null;
    }
    if (annotation.PageClose is PdfJavaScriptAction)
    {
        annotation.PageClose = null;
    }
    if (annotation.PageVisible is PdfJavaScriptAction)
    {
        annotation.PageVisible = null;
    }
    if (annotation.PageInvisible is PdfJavaScriptAction)
    {
        annotation.PageInvisible = null;
    }
    if (annotation.MouseDown is PdfJavaScriptAction)
    {
        annotation.MouseDown = null;
    }
    if (annotation.MouseUp is PdfJavaScriptAction)
    {
        annotation.MouseUp = null;
    }
    if (annotation.MouseEnter is PdfJavaScriptAction)
    {
        annotation.MouseEnter = null;
    }
    if (annotation.MouseLeave is PdfJavaScriptAction)
    {
        annotation.MouseLeave = null;
    }
    PdfLinkAnnotation link = annotation as PdfLinkAnnotation;
    if ((link != null) && (link.Action is PdfJavaScriptAction))
    {
        link.Action = null;
    }
}

private void RemoveFieldActions(PdfField field)
{
    field.CalculateAction = null;
    field.FormatAction = null;
    field.KeyPressAction = null;
    field.ValidateAction = null;

    for (int i = 0; i < field.Widgets.Count; i++)
    {
        if (field.Widgets[i].Focus is PdfJavaScriptAction)
        {
            field.Widgets[i].Focus = null;
        }
        if (field.Widgets[i].Blur is PdfJavaScriptAction)
        {
            field.Widgets[i].Blur = null;
        }
    }
}