Having trouble using applescript to save pdf as excel spreadsheet

Question

I have been trying to use applescript to create an automator action to convert some downloaded PDF's to .xlsx format.  After reviewing a good bit of the SDK documentation, I came up with the following scripting:
tell application "Adobe Acrobat Pro"
                              open theFile
                              save front document to file theNewFile using conversion "com.adobe.acrobat.xlsx"
  close front document
end tell
This script works fine when I use the "com.adobe.acrobat.plain-text" conversion or the png or jpeg conversion. However, I cannot get it to work with "com.adobe.acrobat.xlsx" or "com.adobe.acrobat.spreadsheet".  Note that although I didn't copy the code here that sets theNewFile variable, I have been changing it to the appropriate file extension when changing conversion strings.
When I execute the script using one of the problem conversion strings, Acrobat opens the file successfully, but it just sits there, as if it does not understand the save command at all.
I guess I should mention that the whole goal here is to actually convert the PDF's to CSV eventually.  The next step was going to be to open the file in Excel and save as CSV.  If anyone knows a *free* way to go straight from PDF to CSV using Applescript/Automator without having to go through all these other programs, I would be very appreciative for the suggestion.  This conversion is just a small part of a very lengthy workflow but it is causing me the most trouble.

Answer 1

Hello Jonathan,
Ok i have only one final question.
Do you know how to work in photoshop, don't you? Ok i think yes.
Well i have 2 ways to do that, i did one action from photoshop that will get the image inside folder and will convert this image in pdf. Abouve the line of script
that you have to attach to folder action and the action for Photoshop.
About the action for Photoshop give me your email address and I send you, or do it your self. You have to do this: open one image in JPG, go to action, go new set, put your name of set, put the name of action if you like you can change the name, go print with preview, print and set save as PDF close your file and stop the action.
Now that you have to do is put all your files inside your folder and leave the Photoshop do it for you, ok?
Good Luck
Hack
property speak_alert : false -- if true, the script will speak the alert. If false, the script will display an alert dialog
property dialog_timeout : 30 -- set the amount of time before dialogs auto-answer.
property copychecksindicator : false
property itemcheck_delaytime : 2
property foldercheck_delaytime : 3
property speciallabelindex : 7
on adding folder items to this_folder after receiving added_items
if copychecksindicator is true then
set the added_items to my checkaddeditems(the added_items)
if the added_items is {} then return "no vaild items"
end if
tell application "Finder"
activate
set this_folder to choose folder with prompt "pdf"
set these_files to every file of folder this_folder
end tell
tell application "Finder"
repeat with i from 1 to number of items in these_files
set this_path to (item i of these_files) as string
tell application "Adobe Photoshop CS2"
launch
open file (this_path as string)
set this_files to current document
do action "Jpg" from "Jpg para Pdf"
end tell
end repeat
end tell
end adding folder items to