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

set inFile to (choose file of type {"pdf"} with prompt "Choose your PDF files:")
set targPage to 7

set pRes to removeSpecificPageInPDF(inFile, targPage) of me

on removeSpecificPageInPDF(inFileAlias, targPageNum)
　　set inNSURL to |NSURL|’s fileURLWithPath:(POSIX path of inFileAlias)
　　set theDoc to PDFDocument’s alloc()’s initWithURL:inNSURL
　　
　　set pRes to theDoc’s pageCount()
　　if absNum(targPageNum) of me > pRes or targPageNum = 0 then
　　　　error "PDF Page Range error. This PDF document has " & (pRes as string) & " pages. But you pointed " & (targPageNum as string) & " page from your script. " & return & " (available abs range :1…" & (pRes as string) & ", relative range: -1…-" & (pRes as string) & ")"
　　end if
　　
　　–Allow Relative Page Num ( -1 = the last page)
　　if targPageNum ≤ 0 then
　　　　set targPageNum to pRes + targPageNum + 1
　　end if
　　theDoc’s removePageAtIndex:(targPageNum – 1)
　　
　　–Overwrite Exsiting PDF
　　set aRes to (theDoc’s writeToURL:inNSURL) as boolean
　　
　　return aRes
end removeSpecificPageInPDF