Malicious PDF — malware analysis report

Static analysis result for SHA-256 de408999d64ba0f6…

MALICIOUS

PDF

9.3 KB Created: 2008-04-28 12:17:40 +03:00
MD5: cf94c6d2683703a1ad8bc6ff7c819809 SHA-1: 60a2471f00a0b1db2b342b93350635ce8f6d9ae2 SHA-256: de408999d64ba0f6146ab71ab518643ddaf1539d01de7a4b380aebc573c2afca
66 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, identified by heuristics like PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The embedded JavaScript stream, named javascript_obj0016_000.js, is likely responsible for downloading and executing a secondary payload, a common technique for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0016_000.js
619db473b3abaf88c730323436cee9d827cad01937e8c4ec7e6b6edaf63cbbd1		 pdf-javascript-stream PDF /JS object 16 at offset 0x931 6757 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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