Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6254fa4d7fc1f5…

MALICIOUS

PDF

12.2 KB Created: 2011-02-01 17:03:58 +02:00 Authoring application: Acrobat PDFMaker 7.0.7 for Word (via Acrobat Distiller 7.0.5 (Windows))
MD5: f44cedaac2e18a2bd1ce2b0d1b76cddc SHA-1: c64174d07e9079db7742699d80a8e61605aecad0 SHA-256: 3e6254fa4d7fc1f523500b3e20ac8b8f94d49b19d8ff860c6db8430049a755fd
96 Risk Score

Malware Insights

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

This PDF contains multiple embedded JavaScript streams, one of which is heavily obfuscated and uses an eval() call. The ML classifier strongly indicates maliciousness. The presence of eval() and obfuscated JavaScript suggests the document's primary purpose is to download and execute a second-stage payload. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0027_003.js
9ce7cb2f0408aecb0b7588ef2cd223f959901421d3ad78aa5980349481d24b81		 pdf-javascript-stream PDF /JS object 27 at offset 0x57B 67 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
javascript_obj0001_004.js
8d3d52558fbb283404103f3dbb921869b261bc349343a86c4ecc9c251410c861		 pdf-javascript-stream PDF /JS object 1 at offset 0x9EF 33 bytes
javascript_obj0021_005.js
ad56239f39b4a83e905f339b34ad5e7d3768efbd35e2067307671293c56c5c8d		 pdf-javascript-stream PDF /JS object 21 at offset 0x14EB 7204 bytes

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