extract attachement in a PDF document generated with acrobat XI

Is it normal that Java Aspose library can not get attachements from a PDF document generated with Acrobat 11? (pdfDocument.getEmbeddedFiles().size() returns me 0 ). Or do I need an license to do this ? I'haven't got any evaluation License. How can I get one and how should I install It?

P.S. I was sucessfull executing "getAllAttachementsFromPDF.java" example code using your data but not when I replace the input.pdf file by an input.pdf file generated with acrobat XI.