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11
Why Acrobat?
• Tested Java, Flash, Acrobat & Silverlight
• Java used to work (< JRE 1.6.0_11)
– And persistence only lasted until browser was closed
• Most successful results in Acrobat
– Remains running even after browser closed!
• Flash isn͛t vulnerable (but you can embed flash in 
pdf!)
• Silverlight needs more investigation
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12
Acrobat Overview
• PDFs are made up of objectswhich describe 
pages
• Contains actions
– Goto, URI, Sound, Movie, importData, JavaScript
• This talk focuses on JavaScript actions
– Could also look at other PDF actions
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13
Inserting Script into PDF
• Attach to events
– Document open, page open, page close etc.
• Presentation examples created with ͞Origami͟ 
framework 
– By Guillaume Delugré & Fred Raynal 
• Most of the examples used scripts attached to 
͚document open͛ event
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14
JavaScript Events
• All scripts are executed in response to a particular 
event.
– App = Folder Level
– Batch =  Batch processing.
– Bookmark = Bookmark that executes a script.
– Console = Interactive JavaScript Console 
– Doc = Document Level (e.g. open document)
– External = Through OLE, AppleScript, or loading an FDF
– Field = User interacts with an Acrobat form 
– Link =Llink containing a JavaScript action 
– Menu = JavaScript that has been attached to a menu
– Page = Page Level action (e.g. open page)
– Screen = User interacts with a multimedia screen annotation.
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15
JavaScript Contexts
• Folder level
– Scripts placed here respond to App type events.
• Document level
– Scripts placed here respond to Doc type events.
• Page level
– Scripts placed here respond to Page type events.
• Fieldlevel
– Scripts placed here respond to Field type events.
• Batchlevel
– Scripts are placed here respond to Batch type events.
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16
Privileged vs. Non-privileged
• Some methods require a certain context to run
• Without this restriction, PDFs could read local 
files etc.
• Privileged context:
– Console 
– Batch
– Application initialization events
17
Persistence
• Preventing unloading is possible using 
infinite/timed loops
function pause(time)
{
var paused = true;
var startTime=new Date().getTime();
while(paused)
{
var now=new Date().getTime();
if(now-startTime>time)paused=false;
}
}
18
A note on debugging
• Acrobat Text-to-Speech is useful debug tool
– Debugging console only works in standalone reader
– Acrobat does not have Flash͛s trace() or similar
– Hacking like in the movies!
• Alternatives
– Can use global.setPersistent() to write to disk, but 
didn͛t work consistently for me.
– Can use app.launchURL(͚log.php?͛+msg,true) as ghetto 
trace, but this is SLOW and somewhat unreliable
19
The song that never ends…
• A song to strike fear into 
any school teacher
20
Persistence
• Normally acrobat closes when browser is closed
• If JavaScript is running, PDF prevents browser from 
closing, even though it appears closed
text= “This is the song that never 
ends....”;
tts.pitch=10;
tts.qText(text);
tts.talk();
text= “This is the song that never 
ends....”
tts.pitch=10;
tts.qText(text);
tts.talk();
pause(30000);
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