Malicious PDF — malware analysis report

Static analysis result for SHA-256 d390ee921fd07c18…

MALICIOUS

PDF

6.2 KB
MD5: 9846b9c3c0f6492fdc3a03a28e2622ef SHA-1: bc8859683bf2cb268d2f09287010de0b01a68238 SHA-256: d390ee921fd07c181202a8eddb50d7daddc2a3590eaa0e55dc42100943d8369f
106 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple PDF-specific heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, PDF_UNESCAPE, and PDF_FROMCHARCODE. The JavaScript stream, identified as stream_002_off00000323.js, likely contains obfuscated code designed to execute malicious actions. While the exact payload is not immediately clear due to obfuscation, the presence of these indicators strongly suggests an attempt to exploit the PDF viewer or deliver a secondary payload.

Heuristics 7

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (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)
  • 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/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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000323.js
45ed5ab241de7ef2a7649d4a5832e3b6714f533438a73ac8e38f245e53f8e6fa		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x323 320 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
objstm_0024_00.bin
7eab7033733b2ae707b46efd6e90793cd8b8edd93b16de198494454811e257ef		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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