Aspose.Words v6.3.0.0
Sample code:
new License().SetLicense("Aspose.Words.lic");
Document d1 = new Document("LS-Aspose-B23-Sample.doc");
d1.Save("LS-Aspose-B23-Sample.pdf");
Source DOC and result PDF files attached.
If use DOCX file as source problem doesn't exist.