Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42d58df89c9ce2c…

MALICIOUS

PDF

9.2 KB
MD5: 2c376ee187b188796849a058072fc1b9 SHA-1: 19c189dc15f40c511f16a8cd75722be1c6f3e476 SHA-256: d42d58df89c9ce2ca39706623b626b96500d3458686fd8ce6c8036b8bc3c2c38
66 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream, identified as stream_003_off000004e3.js, exhibits obfuscation and uses eval() and String.fromCharCode, suggesting it's designed to download and execute a secondary payload. 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_003_off000004e3.js
5f31be08597a5caa2961151fabef0ce00200c85767dfb9d855795a3536c65021		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E3 2804 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0031_00.bin
28278117224832a94677f210175d01b1de75ba8e2fa4c5554d521fdd2f81abeb		 pdf-objstm-decoded PDF /ObjStm 31 0 obj (inflated) 542 bytes

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