Malicious PDF — malware analysis report

Static analysis result for SHA-256 323fcc12835ea8db…

MALICIOUS

PDF

85.1 KB
MD5: e4f4631f20d07a14a80ff459aec139ef SHA-1: 0a7dfa8af56943d6700602395c5ef2385dbb21b4 SHA-256: 323fcc12835ea8dbc79ff3ede2f49a89a6d17ccc5386579de6d2875b1c657c8c
80 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicated by the PDF_EVAL heuristic and the extracted artifact stream_002_off00000375.js. The ML classifier also flagged this PDF as malicious. The JavaScript is likely responsible for executing arbitrary code, potentially downloading and running a second-stage payload. Due to the obfuscation and lack of specific indicators, the exact family cannot be determined.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8761

Heuristics 4

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000375.js
d09b3f8531bbd0b9fb1a15b94dac709f7710e3e969ad94204049ce689fed2ee0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x375 18155 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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