Unexpected color space /CS5 in itextsharp

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VB

While extracting text from PDF file using itextsharp iam getting an error "Unexpected color space /CS5 "

I have placed my code and sample file. Kindly do the needful.

Dim simg,tmp,sImgPDFLst As String
simg = AOTD_test_006.pdf
Dim reader As iTextSharp.text.pdf.PdfReader = Nothing
tmp = pdf.parser.PdfTextExtractor.GetTextFromPage(reader, 1, New pdf.parser.SimpleTextExtractionStrategy())
If tmp.Length = 0 Then
sImgPDFLst = "Following files are IMAGE PDF"
End If
reader.Dispose()
reader.Close()
reader = Nothing

link: https://drive.google.com/file/d/0B_nzYHWVJJ7KYjI2OXl2MlFlVzA/edit?usp=sharing