getStringWidth fails with null pointer exception for (damaged?) PDType1CFont

[Esteban R]

I get the following exception when I call getStringWidth:

Exception in thread "main" java.lang.NullPointerException
        at org.apache.pdfbox.pdmodel.font.PDType1CFont.getStringWidth(PDType1CFo
nt.java:348)
        at TestGetStringWidth.main(TestGetStringWidth.java:18)

Sample file: https://gofile.io/d/D0n3EJ
Code to reproduce (full TestGetStringWidth.java at https://gofile.io/d/ttajq7):

        PDDocument doc = PDDocument.load(new File(args[0]));
        PDPage p = doc.getPage(0);
        PDFont f = p.getResources().getFont(COSName.getPDFName("F70"));
        f.getStringWidth("Pa");

Note: A previous exception is dumped while parsing the font so the font seems 
to be corrupted (how to confirm? Adobe Reader doesn't complain about it):

java.io.IOException: java.lang.NumberFormatException: For input string: ".2-"
        at org.apache.fontbox.cff.CFFParser.readRealNumber(CFFParser.java:421)
        at org.apache.fontbox.cff.CFFParser.readEntry(CFFParser.java:278)
        at org.apache.fontbox.cff.CFFParser.readDictData(CFFParser.java:255)
        at org.apache.fontbox.cff.CFFParser.parseType1Dicts(CFFParser.java:732)
        at org.apache.fontbox.cff.CFFParser.parseFont(CFFParser.java:565)
        at org.apache.fontbox.cff.CFFParser.parse(CFFParser.java:122)
        at org.apache.fontbox.cff.CFFParser.parse(CFFParser.java:75)
        at org.apache.pdfbox.pdmodel.font.PDType1CFont.<init>(PDType1CFont.java:
102)
        at org.apache.pdfbox.pdmodel.font.PDFontFactory.createFont(PDFontFactory
.java:74)
        ...

I use pdfbox version 2.0.21 and java 1.8.0_271 in Windows 10 environment.

Esteban Ruiz