Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51fb29d0fe014ca…

MALICIOUS

PDF

8.2 KB
MD5: 51f9e93468e0ae8cc97fe60c063d3c6d SHA-1: ee925a12e4c4171788ddf27691175266ea2b49ac SHA-256: c51fb29d0fe014ca0f584cae8c6247809bda5411c31c993b825680b1fd146def
66 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. This script is likely designed to download and execute a secondary payload. While no specific family is identified, the techniques suggest a downloader or dropper. The benign URLs present do not detract from the malicious nature indicated by the script execution.

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. (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_off00000329.js
99825d97488795be78f40d59be32e2aff36a11569a78e8b703dc45a89af21e45		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x329 3500 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0024_00.bin
de21d81cf6213cf3740b28b8f938e92cbaed8e767a9ea57105e02f29cdac9225		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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