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https://issues.apache.org/jira/browse/PDFBOX-2158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14043019#comment-14043019
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Tilman Hausherr commented on PDFBOX-2158:
-----------------------------------------
It isn't the only problem in that PDF. I get an NPE when trying to render it,
which is due to this decode array:
{code}
<</BitsPerComponent 1/Decode[1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 null null null
null null null null null]/Filter/FlateDecode/Height 140/ImageMask true
{code}
That decode array should have only 2 elements (because of BitsPerComponent 1)
or because it is a mask.
> ExtractText missing most of text in this PDF file, due to font bounding box
> with minus infinity
> -----------------------------------------------------------------------------------------------
>
> Key: PDFBOX-2158
> URL: https://issues.apache.org/jira/browse/PDFBOX-2158
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Affects Versions: 1.8.5
> Environment: Windows x64
> Reporter: Joel Hirsh
> Attachments: negative.text.box.pdf
>
>
> Attached PDF file is missing most of the text when processed by the
> ExtractText example program
> I traced it down to PDFontDescriptorDictionary.getFontBoundingBox() getting a
> rectange for COSName.FONT_BBOX that contained a ymin value of minus
> infinity. That method then creates a PDRectangle which calculates a bounding
> box with a ymin value of -65,329, and results in an enormous text size, and
> things go downhill from there. The text cannot be matched up, and most of it
> ends up being discarded.
> I was able to hack a fix by doing a check in the constructor
> PDRectangle.PDRectangle( COSArray array ) for big negative numbers and
> setting them to 0. With that change, all the text came through as expected.
> However, I don't have enough familiarity with the code to understand what a
> real fix ought to look like.
> The PDF file looks to be fine by other programs such as Acrobat and NitroPDF
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