No /Root object! - Is this really a PDF?

Hi,

I’ve got this PDF (see attachment) which opens just fine in a PDF viewer but fails to get parsed:

PDFSyntaxError                            Traceback (most recent call last)

<ipython-input-21-661fe9476e35> in <module>()
      7 device = TextConverter(rsrcmgr, outfp, codec="utf-8", laparams=LAParams())
      8 interpreter = PDFPageInterpreter(rsrcmgr, device)
----> 9 for page in PDFPage.get_pages(fp, pagenos=set(), caching=True, check_extractable=True):
     10     interpreter.process_page(page)
     11 device.close()

1 frames

/usr/local/lib/python3.6/dist-packages/pdfminer/pdfpage.py in get_pages(cls, fp, pagenos, maxpages, password, caching, check_extractable)
    126         parser = PDFParser(fp)
    127         # Create a PDF document object that stores the document structure.
--> 128         doc = PDFDocument(parser, password=password, caching=caching)
    129         # Check if the document allows text extraction.
    130         # If not, warn the user and proceed.

/usr/local/lib/python3.6/dist-packages/pdfminer/pdfdocument.py in __init__(self, parser, password, caching, fallback)
    594                 break
    595         else:
--> 596             raise PDFSyntaxError('No /Root object! - Is this really a PDF?')
    597         if self.catalog.get('Type') is not LITERAL_CATALOG:
    598             if settings.STRICT:

PDFSyntaxError: No /Root object! - Is this really a PDF?

Steps to reproduce the bug:

f = PDFParser(open(pdf, 'rb'))
doc = PDFDocument(f)

W020160201380721221093.pdf