Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8cdd77201f55bd…

MALICIOUS

PDF

6.3 KB
MD5: 29b888bb33747da465eecf5fcd69e564 SHA-1: 38e526fa93c4e42d8c0d316a8fb8f20738b35766 SHA-256: 7b8cdd77201f55bdfbcbcc204c0a22e9cbb7e1818783fc3422d4872b07494d32
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains JavaScript code, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS_EXPLOIT_CLUSTER'. The presence of 'unescape()' and the ML classifier's high confidence suggest the JavaScript is malicious and likely exploits a vulnerability to achieve code execution. The benign URLs extracted are standard PDF namespaces and do not indicate malicious activity. No specific malware family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • JavaScript action low 2 related findings 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)
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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)
  • 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# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000324.bin
92828ca4e59823b831852d245a344ecc0f224c54b3d8f2093f71ac18b84737d9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x324 320 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0024_00.bin
0026942ce60429511ecb90e5efa98990b6f28a4f0b18d872c8533adc483f021a		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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