Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc023fa2c77e1ff…

MALICIOUS

PDF

6.4 KB
MD5: 2649b35d7f59681b485d0d42cfc52fc8 SHA-1: 89f64d4cdadfe0c6305ae0e03c133072b7a49608 SHA-256: dcc023fa2c77e1ffddc0aa2f735d1058098cae59a7b95b962d7f69772b2d03b6
64 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing suggests the script uses eval() to execute code, and PDF_FROMCHARCODE indicates obfuscation techniques. While no specific URLs or malicious scripts were directly extracted, the combination of these heuristics strongly suggests the PDF is designed to exploit a vulnerability and execute arbitrary code, likely downloading a second-stage payload.

Heuristics 5

  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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)
  • 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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0024_00.bin
16a7865ca46098ec9f62f3473daf3b8d62990141b7993de7382e31d29e11ee32		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 385 bytes

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