Issue in Email send program?

Hi Experts,

@Alessandro Iannacci @Horst Schaude @Vinodkumar Kommineni

I have create a program by following the post of @Alessandro Iannacci New email functionality for tenants 1502 SP01 which is very well explain.

I am able to send the email successfully including the attachments(doc,xls).

But when it comes to pdf. I am not able to open pdf which i receive in email.It's showing fail to load the file/file not decoded properly. Below is code images and text file.

Error message.

Regards,
Quddus.