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Paul Rayman  
#1 Posted : Wednesday, July 1, 2020 8:17:27 AM(UTC)
Paul Rayman

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Joined: 1/5/2016(UTC)
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using(var doc = PdfDocument.CreateNew())
    var page = doc.Pages.InsertPageAt(0, 612, 792);

    var data = File.ReadAllBytes(@"file attachment.pdff");

    AddAttachmentAsAnnotation(page, data, "TestAttachemnt1.pdf");
    AddAttachmentIntoCatalog(doc, data, "TestAttachemnt2.pdf");
    doc.Save(@"test.pdf", SaveFlags.NoIncremental);

private static void AddAttachmentAsAnnotation(PdfPage page, byte[] data, string name)
    var annot = new PdfFileAttachmentAnnotation(page, FileIconNames.Paperclip, name, data, 50, 50);
    if (page.Annots == null)

private static void AddAttachmentIntoCatalog(PdfDocument doc, byte[] data, string name)
    if (!doc.Root.ContainsKey("Names"))
        doc.Root["Names"] = PdfTypeDictionary.Create();
    var names = doc.Root["Names"].As<PdfTypeDictionary>();

    if (!names.ContainsKey("EmbeddedFiles"))
        names["EmbeddedFiles"] = PdfTypeDictionary.Create();
    var embeddedFiles = names["EmbeddedFiles"].As<PdfTypeDictionary>();

    if (!embeddedFiles.ContainsKey("Names"))
        embeddedFiles["Names"] = PdfTypeArray.Create();
    var attachments = embeddedFiles["Names"].As<PdfTypeArray>();

    attachments.Add(PdfTypeString.Create(name, true));
    var attachmentDict = PdfTypeDictionary.Create();
    var fs = new PdfFileSpecification(doc, attachmentDict); 
    fs.EmbeddedFile = new PdfFile(data);
    fs.FileName = name;
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