set aHFSPath to (choose file of type {"com.adobe.pdf"} with prompt "Choose a PDF with Annotation")
set aPOSIX to POSIX path of aHFSPath
set aURL to (current application’s |NSURL|’s fileURLWithPath:aPOSIX)

set aPDFdoc to current application’s PDFDocument’s alloc()’s initWithURL:aURL
set pCount to aPDFdoc’s pageCount()

set firstPage to (aPDFdoc’s pageAtIndex:0)

set anoList to (firstPage’s annotations()) as list

repeat with i in anoList
　　(firstPage’s removeAnnotation:i)
end repeat