How to attach a pdf in outlook using javascript??

Hi,

I got a request of one page PDF document from my client via email.

In the bottom, I'm having a submit button where I need to attach the PDF into outlook and that part has been done. When I click the submit button new mail is generating, but I need to attach the pdf file by replying to the original Client email. So, for that I need to find the email subject which the Client has sent.

I want a javascript code to do this work.

Kindly assist me by sending the JavaScript code.

Thanks in advance.