Identified Images cannot be converted to image due to invalid (?) content

PLEASE HELP ME CANCEL/CLOSE THIS ISSUE

My original search was incorrect, and this is a duplicate (times about 10).

In this file, 18 images are identified. But the following code cannot convert any images:

$pdf = $parser->parseFile($pdfFile) ;
$images = $pdf->getObjectsByType('XObject', 'Image') ;
foreach ($images AS $imgKey => $pdfImage) {
    try {
        $image = @imagecreatefromstring($pdfImage->getContent()) ;
    } catch (Exception $e) {
        $image = false ;
    }
    if ($image)
        printf("Image[$imgKey] converted.\n") ;
    else
        printf("Image[$imgKey] could not be converted.\n") ;
}

The encoding here seems to be 'FlateDecode' for all images in this file. I did not find any help to lead me to believe this should not work. Is my approach incorrect?

Start by reproducing the issue with the linked PDF and the shown getObjectsByType('XObject', 'Image') and getContent() calls. Check whether this report is already covered by the duplicate issues referenced in the message; the issue itself requests closure, so no implementation completion condition is provided.