Error getting content from PDF document

We have documents that are digitally signed and the document could be displayed in Confluence 4.3.7. When I upload a document to the new version of confluence 5.3.1 the content cannot be retrieved from the PDF document.

Stack Trace:
2013-10-30 16:42:30,071 WARN [scheduler_Worker-1] [bonnie.search.extractor.BaseAttachmentContentExtractor] addFields Error indexing attachment (Attachment: dd2875_SnF_Example.pdf v.1 (720898) confluence-admin)
com.atlassian.bonnie.search.extractor.ExtractorException: Error getting content of PDF document
at com.atlassian.bonnie.search.extractor.PdfContentExtractor.extractText(PdfContentExtractor.java:96)
at com.atlassian.bonnie.search.extractor.BaseAttachmentContentExtractor.addFields(BaseAttachmentContentExtractor.java:41)
at com.atlassian.confluence.plugin.descriptor.ExtractorModuleDescriptor$BackwardsCompatibleExtractor.addFields(ExtractorModuleDescriptor.java:42)
at com.atlassian.confluence.search.lucene.ConfluenceDocumentBuilder.extractWithLuceneExtractors(ConfluenceDocumentBuilder.java:130)
at com.atlassian.confluence.search.lucene.ConfluenceDocumentBuilder.getDocument(ConfluenceDocumentBuilder.java:100)
at com.atlassian.confluence.search.lucene.tasks.AddDocumentIndexTask.perform(AddDocumentIndexTask.java:43)
at com.atlassian.confluence.search.lucene.tasks.UpdateDocumentIndexTask.perform(UpdateDocumentIndexTask.java:40)
at com.atlassian.confluence.search.lucene.tasks.BulkWriteIndexTask.perform(BulkWriteIndexTask.java:44)
at com.atlassian.bonnie.LuceneConnection.withWriter(LuceneConnection.java:249)
at com.atlassian.confluence.search.lucene.tasks.LuceneConnectionBackedIndexTaskPerformer.perform(LuceneConnectionBackedIndexTaskPerformer.java:20)
at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager$BatchUpdateAction.perform(DefaultConfluenceIndexManager.java:427)
at com.atlassian.bonnie.LuceneConnection.withBatchUpdate(LuceneConnection.java:282)
at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager.processTasks(DefaultConfluenceIndexManager.java:204)
at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager.flushQueue(DefaultConfluenceIndexManager.java:156)
at sun.reflect.GeneratedMethodAccessor501.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at com.sun.proxy.$Proxy90.flushQueue(Unknown Source)
at com.atlassian.confluence.search.lucene.IndexQueueFlusher.executeJob(IndexQueueFlusher.java:30)
at com.atlassian.confluence.setup.quartz.AbstractClusterAwareQuartzJobBean.surroundJobExecutionWithLogging(AbstractClusterAwareQuartzJobBean.java:64)
at com.atlassian.confluence.setup.quartz.AbstractClusterAwareQuartzJobBean.executeInternal(AbstractClusterAwareQuartzJobBean.java:46)
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)
at org.quartz.core.JobRunShell.run(JobRunShell.java:199)
at com.atlassian.confluence.schedule.quartz.ConfluenceQuartzThreadPool$1.run(ConfluenceQuartzThreadPool.java:20)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)
Caused by: com.oracle.security.ucrypto.UcryptoException: CRYPTO_ENCRYPTED_DATA_LEN_RANGE
at com.oracle.security.ucrypto.NativeCipher.doFinal(NativeCipher.java:645)
at com.oracle.security.ucrypto.NativeCipher.engineDoFinal(NativeCipher.java:485)
at com.oracle.security.ucrypto.NativeCipher.engineDoFinal(NativeCipher.java:464)
at com.oracle.security.ucrypto.NativeCipherWithJavaPadding.engineDoFinal(NativeCipherWithJavaPadding.java:398)
at com.oracle.security.ucrypto.NativeCipherWithJavaPadding.engineDoFinal(NativeCipherWithJavaPadding.java:365)
at javax.crypto.Cipher.doFinal(Cipher.java:1970)
at javax.crypto.CipherInputStream.getMoreData(CipherInputStream.java:107)
at javax.crypto.CipherInputStream.read(CipherInputStream.java:224)
at javax.crypto.CipherInputStream.read(CipherInputStream.java:200)
at org.apache.pdfbox.pdmodel.encryption.SecurityHandler.encryptData(SecurityHandler.java:313)
at org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decryptStream(SecurityHandler.java:412)
at org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decrypt(SecurityHandler.java:384)
at org.apache.pdfbox.pdmodel.encryption.SecurityHandler.decryptObject(SecurityHandler.java:358)
at org.apache.pdfbox.pdmodel.encryption.SecurityHandler.proceedDecryption(SecurityHandler.java:195)
at org.apache.pdfbox.pdmodel.encryption.StandardSecurityHandler.decryptDocument(StandardSecurityHandler.java:156)
at org.apache.pdfbox.pdmodel.PDDocument.openProtection(PDDocument.java:1366)
at org.apache.pdfbox.pdmodel.PDDocument.decrypt(PDDocument.java:798)
at com.atlassian.bonnie.search.extractor.PdfContentExtractor.extractText(PdfContentExtractor.java:64)
... 30 more