make layer/pictures on the top dissapear

[ZMK]

I am using the foxit reader to view some Power Point presentations that have been exported to PDF.
The problem is that many slides include multiple pictures that are one above the other (in the original PPT they appeared in a animated manner). During viewing the PDF page you can see for a very short time (during the loading process) the underlying pictures, so the data is there. How can I make the upper pictures "disappear" like layers?
"Manage layer papers" is blank.

Thanks,

ZMK

[cherry]

Hi ZMK,

Is it possible to send us a copy of the mentioned PDF document for testing purpose? Thank you. If it is inconvenient to upload here, please email the attachment to [email protected].

[ZMK]

Here is the exaple. Its a little bit more difficult, but its a good example. Behind the "?" and the "blue squares" there are numbers that I need to know. How do I make the "?" and the "blue boxes" disappear?
I solved the problem by importing the file in to Inkscape.But with larger files I really got a problem.

http://www.file-upload.net/download-8759153/23-Lungentumore.pdf.html

[cherry]

Hi ZMK,

The mentioned "?" and "blue boxes belong to shape objects. If to delete them, we have to install Foxit PhantomPDF Standard or Business, then go under "Edit"->"Edit Objects"->then select them to delete.

Foxit PhantomPDF is free to try out for 30 days. You may download it from our website and give it a try: http://www.foxitsoftware.com/downloads/