property |NSURL| : a reference to current application’s |NSURL|
property PDFDocument : a reference to current application’s PDFDocument

set aHFSPath to (choose file of type {"com.adobe.pdf"} with prompt "Select PDF")
set sizeRes to retPDFSizeInfo(aHFSPath) of me
–>　　{​​​​​width:595.28, ​​​​​height:841.89​​​}

–PDFのサイズを取得する（単位：Point）
on retPDFSizeInfo(aHFSPath)
　　set aPOSIX to POSIX path of aHFSPath
　　set aURL to (|NSURL|’s fileURLWithPath:aPOSIX)
　　
　　set aPDFdoc to PDFDocument’s alloc()’s initWithURL:aURL
　　set pCount to aPDFdoc’s pageCount()
　　set aPage to aPDFdoc’s pageAtIndex:0
　　
　　set aBounds to aPage’s boundsForBox:(current application’s kPDFDisplayBoxMediaBox)
　　
　　set aClass to class of aBounds
　　if aClass = record then
　　　　set aSize to |size| of aBounds
　　else if aClass = list then
　　　　set aWidth to item 1 of item 2 of aBounds
　　　　set aHeight to item 2 of item 2 of aBounds
　　　　set aSize to {width:aWidth, height:aHeight}
　　else
　　　　error "Wrong PDF….Can not get bounds from PDF"
　　end if
　　
　　return aSize
end retPDFSizeInfo