Adobe 6 or later PDF not openable

[ivobrabec]

Hi,
i have the following problem. We create PDF using pdflib on our server and i need to work with such PDF later with imagick functions. Recently we switched to newer version of pdflib which created PDF "Open with: Adobe 6 or later". Before the pdflib was creating PDFs with "Adobe 5 or later". The Adobe5 pdfs work OK with imagick, adobe 6 cannot be opened with $handle=new Imagick();
$handle->readImage($src);

they are the same PDFs, no other difference. Is there something how to solve it? Thanks for your help in advance
Friendly yours
Ivo