Malicious PDF — malware analysis report

Static analysis result for SHA-256 855d121899a72a32…

MALICIOUS

PDF

293.6 KB Created: 2008-08-27 13:50:01 -07:00 Authoring application: Acrobat PDFMaker 8.1 for Word (via Acrobat Distiller 8.1.0 (Windows))
MD5: d238dde37754923ff3f46f6d32f1fb5c SHA-1: 6f2486c5b3ed15015d9fbe2778975e118a2933e4 SHA-256: 855d121899a72a320b7ab44c9f45c5add3fae075fd481338c35f48ab6823b66f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript T1059.007 JavaScript

The PDF contains embedded JavaScript, including an eval() call, which is a strong indicator of malicious intent. The JavaScript is likely used to download and execute a secondary payload, as suggested by the 'Suspicious extracted artifact' heuristic. No specific malware family could be identified.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3579

Heuristics 6

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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.
  • Additional-actions dictionary low PDF_AA
    PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_004.js
3d42e8e110bee5200c9e59e7f238b3b0aacf686a47bc6702b9fb97e28392ca75		 pdf-javascript-stream PDF /JS object 1 at offset 0xF 1541 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 eval/decoder/string-building token(s).
stream_025_off0003f767.bin
bc58bedfe313823d3f5bfe831b2a75722be8bba5dfe4d7360d85519683d5b5a1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3F767 15447 bytes
icc_00_off00032137.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x32137 3144 bytes

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