[PDFBOX-2936] javax.crypto.BadPaddingException: Given final block not properly padded

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.8.10, 1.8.11, 2.0.0
• Fix Version/s: 1.8.11, 2.0.0
• Component/s: Crypto, Preflight
• Labels: DHS
• Environment: java version "1.8.0_25"; Java(TM) SE Runtime Environment (build 1.8.0_25-b17); Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)
• Assignee: Tilman Hausherr
• Reporter: Daniel Woelfel
• Created: 15/Aug/15 01:35
• Updated: 13/Apr/17 13:48
• Resolved: 18/Aug/15 16:20

Description

I get the following stack trace when trying to parse certain pdfs:

org.apache.pdfbox.preflight.exception.SyntaxValidationException
        at org.apache.pdfbox.preflight.parser.PreflightParser.parse(PreflightParser.java:203)
        at org.apache.pdfbox.preflight.parser.PreflightParser.parse(PreflightParser.java:180)
        at org.apache.pdfbox.preflight.parser.PreflightParser.parse(PreflightParser.java:168)
        at PDFBoxTest.main(hello.java:11)
Caused by: org.apache.pdfbox.exceptions.WrappedIOException
        at org.apache.pdfbox.pdmodel.encryption.SecurityHandler.encryptData(SecurityHandler.java:376)
        at org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decryptString(SecurityHandler.java:578)
        at org.apache.pdfbox.pdfparser.NonSequentialPDFParser.decryptString(NonSequentialPDFParser.java:1571)
        at org.apache.pdfbox.pdfparser.NonSequentialPDFParser.decryptDictionary(NonSequentialPDFParser.java:1535)
        at org.apache.pdfbox.pdfparser.NonSequentialPDFParser.decrypt(NonSequentialPDFParser.java:1596)
        at org.apache.pdfbox.preflight.parser.PreflightParser.parseObjectDynamically(PreflightParser.java:797)
        at org.apache.pdfbox.pdfparser.NonSequentialPDFParser.parseObjectDynamically(NonSequentialPDFParser.java:1343)
        at org.apache.pdfbox.preflight.parser.PreflightParser.initialParse(PreflightParser.java:273)
        at org.apache.pdfbox.pdfparser.NonSequentialPDFParser.parse(NonSequentialPDFParser.java:886)
        at org.apache.pdfbox.preflight.parser.PreflightParser.parse(PreflightParser.java:198)
        ... 3 more
Caused by: javax.crypto.BadPaddingException: Given final block not properly padded
        at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:966)
        at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:824)
        at com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:436)
        at javax.crypto.Cipher.doFinal(Cipher.java:2004)
        at org.apache.pdfbox.pdmodel.encryption.SecurityHandler.encryptData(SecurityHandler.java:352)
        ... 12 more

The parsing code looks something like:

FileDataSource fd = new FileDataSource("i-129.pdf");
PreflightParser parser = new PreflightParser(fd);
parser.parse();