Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5157fc6747e9aea…

MALICIOUS

PDF

7.4 KB Created: 2009-07-13 19:22:54 Authoring application: KsZ (via SCM)
MD5: 72e1e5d52bd804f6d37c8e3d50c4a3bb SHA-1: ca1931e99a6e82ad69e0cdff89be33980f2f544c SHA-256: a5157fc6747e9aea8ae3b94b5063d1a7a502fc8112d0fe1342ec817b7b6db261
106 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier and correlated signals strongly suggest malicious intent. The JavaScript appears to be obfuscated, but the presence of `app.setTimeOut` and string concatenation suggests it is designed to execute further code, likely downloading and running a second-stage payload. The specific JavaScript string `app.setTimeOut(MsD+'edWT=(YnR.JcE7+YnR.uyO+YnR.eIV SCM MmXk7 D:20090713192254` is included as a potential indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • Correlated malicious PDF JavaScript signals critical PDF_CORRELATED_MALICIOUS_JS
    PDF JavaScript or auto-action content is corroborated by exploit staging, ML, or suspicious extracted-artifact findings. This correlation promotes old exploit-kit PDFs that otherwise remain in the suspicious band because each individual signal is intentionally weighted conservatively.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.