Determine which user will be using Open Office and open the program from that account
If you do not have setuid installed and the web server is running under 'nobody', then you can create a special user that will be responsible for handling the conversion of the documents. In either case, you need to create an OpenOffice.org Basic macro.
From the Open Office window, select Tools > Macros > Organize Macros > OpenOffice.org Basic

We are going to edit Module1's 'Main' macro. Select 'Edit' button from right menu.
Overwrite the contents of this module with the following:
REM ***** BASIC *****
Sub ConvertToPDF( cFile )
cURL = ConvertToURL( cFile )
' MsgBox( cURL )
' Open the document.
' Just blindly assume that the document is of a type that OOo will
' correctly recognize and open -- without specifying an import filter.
oDoc = StarDesktop.loadComponentFromURL( cURL, "_blank", 0, Array(MakePropertyValue( "Hidden", False )) )
cFile = Left( cFile, Len( cFile ) - 4 ) + ".pdf"
cURL = ConvertToURL( cFile )
oDoc.storeToURL( cURL, Array(_
MakePropertyValue( "FilterName", "writer_pdf_Export" ))
oDoc.close( True )
End Sub
Sub ConvertToDOC( cFile )
cURL = ConvertToURL( cFile )
oDoc = StarDesktop.loadComponentFromURL( cURL, "_blank", 0, Array(MakePropertyValue( "Hidden", True )) )
cFile = Left( cFile, Len( cFile ) - 4 ) + ".doc"
cURL = ConvertToURL( cFile )
oDoc.storeToURL( cURL, Array(_
MakePropertyValue( "FilterName", "MS Word 97" ))
oDoc.close( True )
End Sub
Function MakePropertyValue( Optional cName As String, Optional uValue ) As com.sun.star.beans.PropertyValue
Dim oPropertyValue As New com.sun.star.beans.PropertyValue
If Not IsMissing( cName ) Then
oPropertyValue.Name = cName
EndIf
If Not IsMissing( uValue ) Then
oPropertyValue.Value = uValue
EndIf
MakePropertyValue() = oPropertyValue
End Function
Sub Main
End Sub
Save and Exit, your macro is now ready for use!