Hmm, okay. Not an APDF problem 
Not sure what's wrong. Is fxScan correctly installed? A lot of its functionality is distributed across a few different modules - maybe one of them is missing/wrong processor version.
fxSCAN should be installed properly. I created usable PDFs in the past. As I wrote - there were no error messages from fxSCAN while creating the PDF.
Its just that I cannot open the PDF...
I edited the test.pdf, but cannot see any obvious errors:
%PDF-1.2
%âãÏÓ
1 0 obj
<<
/Producer (fxSCAN 4.0 PDF Export - see
http://www.fxscan.com/)
>>
endobj
4 0 obj
<<
/Type /XObject
/Subtype /Image
/Name /Im0
/Width 544
/Height 833
/BitsPerComponent 8
/ColorSpace /DeviceRGB
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/Filter /DCTDecode
>>
endobj
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-18
endobj
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<<
/Type /XObject
/Subtype /Image
/Name /Im1
/Width 544
/Height 833
/BitsPerComponent 8
/ColorSpace /DeviceRGB
/Length 7 0 R
/Filter /DCTDecode
>>
endobj
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-18
endobj
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/Type /XObject
/Subtype /Image
/Name /Im2
/Width 543
/Height 833
/BitsPerComponent 8
/ColorSpace /DeviceRGB
/Length 9 0 R
/Filter /DCTDecode
>>
endobj
9 0 obj
-18
endobj
10 0 obj
<<
/ProcSet [/PDF /ImageC]
/XObject << /Im0 4 0 R /Im1 6 0 R /Im2 8 0 R >>
>>
endobj
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<<
/Type /Page
/Parent 3 0 R
/MediaBox [ 0 0 544 833 ]
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>>
endobj
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<<
/Length 13 0 R
>>
stream
q 544 0 0 833 0 0 cm /Im0 Do Q
endstream
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31
endobj
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/Type /Page
/Parent 3 0 R
/MediaBox [ 0 0 544 833 ]
/Resources 10 0 R
/Contents 15 0 R
>>
endobj
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<<
/Length 16 0 R
>>
stream
q 544 0 0 833 0 0 cm /Im1 Do Q
endstream
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31
endobj
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/Type /Page
/Parent 3 0 R
/MediaBox [ 0 0 543 833 ]
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>>
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<<
/Length 19 0 R
>>
stream
q 543 0 0 833 0 0 cm /Im2 Do Q
endstream
endobj
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31
endobj
2 0 obj
<<
/Type /Catalog
/Pages 3 0 R
/Pages 3 0 R
>>
endobj
3 0 obj
<<
/Type /Pages
/Count 3
/MediaBox [0 0 612 792]
/Kids [11 0 R 14 0 R 17 0 R ]
>>
endobj
xref
0 20
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trailer
<<
/Size 20
/Root 2 0 R
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>>
startxref
1541
%%EOF