PDF malware analysis — malicious · 766df0bc0452e85c

MALICIOUS

PDF

291.8 KB

MD5: e74ff3fc063b7095f0d86d48452dffea SHA-1: df86346607d3563ea02d270d88d74cdb8bdb1e54 SHA-256: 766df0bc0452e85c2a0c255c5ef0fcd25772c79ff7c69e236b0d67bc7347e503

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript, named 'javascript_obj0008_000.js', is the primary artifact and likely contains the malicious payload, potentially for downloading and executing further stages.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `9d30ac590694e2b940448d0e36852783f3cdd74ff7f53c5760d8fbcf235bb7c5`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1CE	99336 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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