It is not possible to add attachments to email notifications in IDQ.
If the workflow logic allows, you can try using a Java Transformation to write code which sends out emails with attachments. However, I cannot comment on the feasibility or how exactly this can be achieved.
Currently in any of the existing Product versions, there is no option available to send an attachment with the Notification Task in a Workflow.
We have raised a feature request BDM-24728 (BDM-24728 : Attachment in Email service ) to provide this feature and this will be implemented in a future release.
You can create a script to send a mail with the attachment and run that script via command task in the workflow. This will be the easier way to do it.
Create a shell script with 'sendmail'/similar commands for sending email with required attachments. Use the created shell script as a Command Task in the workflow at required step to send email. In addition there are other commands like 'mutt', 'swaks' which can also be used for sending email with attachments. For more information on the same, please use the following reference link: http://backreference.org/2013/05/22/send-email-with-attachments-from-script-or-command-line/