passing a memory stream to the Word, I did this, but the images are missing:
using (MemoryStream ms = new MemoryStream(ByteArrayFromWord))
{
WordDocument wordDoc = new WordDocument(ms);
DocToPDFConverter converter = new DocToPDFConverter();
PdfDocument pdfDoc = converter.ConvertToPDF(wordDoc);
pdfDoc.Save(tempWordPdfFile);
pdfDoc.Save(_tempMemoryStream);
_tempDatei = _tempMemoryStream.ToArray();
wordDoc.Close();
converter.Dispose();
pdfDoc.Close();
}