Malicious PDF — malware analysis report

Static analysis result for SHA-256 726ab4508ac72564…

MALICIOUS

PDF

87.2 KB Created: 2008-03-03 17:06:00 UTC
MD5: db196efac61bb4ec72536c06c442e110 SHA-1: dffd4e0b126152bc9b98aa996181bde9fcbbc298 SHA-256: 726ab4508ac72564d694a1f29ff36a2bf5593c86730641045419005b094a9296
166 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classification and heuristic analysis. It contains embedded JavaScript with an eval() call, indicating an attempt to execute arbitrary code. The presence of XFA form elements further suggests a potential exploit vector. The JavaScript stream is likely responsible for downloading and executing a secondary payload, though its exact function is obscured.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8654

Heuristics 8

  • 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)
  • 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)
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic (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.pdf-repair.com
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://www.w3.org/1999/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00000dcd.bin
28d5ff4b6f449ddbcbdcc33dfd319b38a2a15e42d1e4051efbf9d5590f4e5764		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDCD 1561 bytes
stream_004_off0000115f.js
d09b3f8531bbd0b9fb1a15b94dac709f7710e3e969ad94204049ce689fed2ee0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x115F 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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