@sohil,
Please ZIP and upload your input Word document and Aspose.Words generated PDF file showing the undesired behavior here for testing. Any additional steps that you think might be required to reproduce this issue on our end. For example, in Aspose.Words generated PDF, how do you verify that the attachments have zero size? It would be great if you please also provide a console application (source code without compilation errors) that helps us to reproduce this issue on our end. We will then investigate the issue on our end and provide you more information.