How can we save the attachement in PI application server

Hi Gurus,

    I have a scenario from SOAP- IDOC.The third party sending the data as an attachment,so in PI,the  attachment has to be saves in the PI application server and the payload has to be passed to the IDOC as-is.Could you please let me know how could we acheive this scenario??How can we save the attachment in PI application server.It would be very grateful if you share your thoughts/Suggestions.

Thanks in advance!!