Fix for iTextSharp created PDFs.

ExtendedApprovals.cs

public class ExtendedApprovals
{
    /// <summary>
    /// This compares a PDF document saved in a byte stream.
    /// </summary>
    /// <param name="bytes">A byte array that represents the contents of the PDF file to be verified</param>
    public static void VerifyPdf(byte[] bytes)
    {
        var actual = ScrubCreationDateInPdf(bytes);

        var writer = new ApprovalTests.Writers.BinaryWriter(actual, "pdf");
        var namer = Approvals.GetDefaultNamer();

        var basename = String.Format(@"{0}\{1}", namer.SourcePath, namer.Name);
        var received = Path.GetFullPath(writer.GetReceivedFilename(basename));
        received = writer.WriteReceivedFile(received);

        Approvals.Verify(new ExistingFileWriter(received));
    }

    private static byte[] ScrubCreationDateInPdf(byte[] actual)
    {
        var stream = new MemoryStream(actual, 0, actual.Length, true);

        ScrubInPlace(stream, "/CreationDate(", "/CreationDate(D:20110426104115-07'00')");
        ScrubInPlace(stream, "/ModDate(", "/ModDate(D:20110426104115-07'00')");
        ScrubInPlace(stream, "/ID [<", "/ID [<02f36b9088ef0614b00d885a1b5037cf><38ccb29766064dab2071f1ac6a9056fc>]>>");

        stream.Flush();
        return stream.ToArray();
    }

    private static void ScrubInPlace(MemoryStream stream, string start, string replacement)
    {
        var offset = PdfScrubber.Find(start, stream);

        if (0L > offset)
            return;

        stream.Seek(offset, SeekOrigin.Begin);

        var bytes = new ASCIIEncoding().GetBytes(replacement);
        stream.Write(bytes, 0, bytes.Length);
    }
}