Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b85ef341d207f29…

MALICIOUS

PDF

6.2 KB
MD5: 8a19bfe01846766a5eeb46b99638d526 SHA-1: 3ce5fbb71fd0cd51ab960cdb4936031769ef94ac SHA-256: 0b85ef341d207f297facdb5d7c4e4a404531480acbf3f8a0fa8e2d50839cc74d
150 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS_EXPLOIT_CLUSTER. The presence of an eval() call within the JavaScript stream indicates that the script is likely designed to execute arbitrary code, potentially downloading and running a secondary malicious payload. The ML classifier also strongly indicates maliciousness. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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)
  • 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_off00000324.js
6aac0df4a340f643c783d64ba3ffe9bd9ab5e8b8bf3cec16cdddf832671c3327		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x324 261 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0024_00.bin
56fbb62419a2db465136578c49d8cf2e0052c6bea67d373292ea69746d4c53f7		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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