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https://issues.apache.org/jira/browse/PDFBOX-5747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17921205#comment-17921205
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Richard Eckart de Castilho commented on PDFBOX-5747:
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[~tilman] Thanks for jumping on it right away :) I'm quite sure this fix will
make pdfbox quite a bit more useful for processing scientific papers.
> Surrogate pairs with combining diacritics are incorrectly ordered on text
> extraction
> ------------------------------------------------------------------------------------
>
> Key: PDFBOX-5747
> URL: https://issues.apache.org/jira/browse/PDFBOX-5747
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Affects Versions: 2.0.30, 2.0.33, 3.0.4 PDFBox
> Reporter: P Crossa
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.34, 3.0.5 PDFBox, 4.0.0
>
> Attachments:
> PDFBOX-5747-unicode-surrogate-with-diacritic-reduced.pdf, PDFBOX-5747.patch,
> invchar.pdf
>
>
> When extending {*}{{PDFTextStripper}}{*}, the *{{writeString}}* override
> receives a {*}{{List<TextPosition>}}{*}. When iterating over them, the
> {{*getUnicode()*}} call should return the Unicode representation of the
> extracted text.
> However, for glyphs that require a surrogate pair (such as some mathematical
> symbols, e.g. 𝑋) that are modified with a combining diacritic (such as ^),
> the extracted Unicode characters are out of order.
> The attached PDF contains 𝑋̂. This is composed of 𝑋, which is represented as
> the surrogate pair {color:#cc7832}\uD835\uDC4B {color}and the combining
> diacritic {color:#cc7832}\u0302{color}
> {color:#172b4d}However, when extracted, we get
> {color}\uD835\u0302\uDC4B{color:#172b4d} (the combining diacritic is placed
> in between the two characters of the surrogate pair). This is an invalid
> representation, and when encoded as a Json will break most parsers. The
> expected output would be {color}\uD835\uDC4B\u0302
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