Bad resource data offset 0

Question

GraphicConverter (an image processing program) is dumping this message onto my console about 2 of my files:
bad resource data offset 0 and size -928468624 in file
     I routinely check my file system with DiskUtility, Disk Warrior, etc. for any inconsistencies.  I can open the files fine from Finder; what is a "bad resource data offset" and does it mean anything about these files in my file system that I should be concerned about?

Answer 1

Here's what I see when I do mdls on one of those files:
kMDItemContentCreationDate
= 2010-08-25 07:10:09 -0400
kMDItemContentModificationDate = 2010-08-25 07:10:09 -0400
kMDItemContentType        
= "com.adobe.pdf"
kMDItemContentTypeTree    
= (
"com.adobe.pdf",
"public.data",
"public.item",
"public.composite-content",
"public.content"
kMDItemDisplayName        
= "pnas00101-0399.pdf"
kMDItemEncodingApplications
= (
"Apex PDFWriter"
kMDItemFSContentChangeDate
= 2010-08-25 07:10:09 -0400
kMDItemFSCreationDate     
= 2010-08-25 07:10:09 -0400
kMDItemFSCreatorCode      
= ""
kMDItemFSFinderFlags      
= 0
kMDItemFSHasCustomIcon    
= 0
kMDItemFSInvisible        
= 0
kMDItemFSIsExtensionHidden
= 0
kMDItemFSIsStationery     
= 0
kMDItemFSLabel            
= 0
kMDItemFSName             
= "pnas00101-0399.pdf"
kMDItemFSNodeCount        
= 0
kMDItemFSOwnerGroupID     
= 20
kMDItemFSOwnerUserID      
= 501
kMDItemFSSize             
= 1024494
kMDItemFSTypeCode         
= ""
kMDItemKind               
= "Adobe PDF document"
kMDItemLastUsedDate       
= 2012-05-24 07:57:45 -0400
kMDItemNumberOfPages      
= 8
kMDItemPageHeight         
= 747.6
kMDItemPageWidth          
= 493.44
kMDItemSecurityMethod     
= "None"
kMDItemUsedDates          
= (
"2010-08-25 00:00:00 -0400",
"2012-05-24 00:00:00 -0400"
kMDItemVersion            
= "1.3"