PDF malware analysis — malicious · aa6d5c802a5748c1

MALICIOUS

PDF

2.8 KB

MD5: ec286200421a928126c31700dbdf50a7 SHA-1: c4ecec30cb4dc9e53a6ab65b959233bbbe8765be SHA-256: aa6d5c802a5748c1ed6e3c131f5d01df8986590ed447865b705ed44751356123

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged this PDF as malicious with a high score. The embedded JavaScript streams, named 'javascript_obj111611_000.js' and 'javascript_obj111612_001.js', are likely responsible for executing malicious code. The use of eval() and String.fromCharCode suggests obfuscation techniques are employed to hide the script's true intent, which is presumed to be downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `4d6481ef7e0ca2ae361550048874cf5ce452cc7070fbb5a25c16785bb41ee6e3`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `151215a87bde51ac100d43e54d2bdf26188587001bf0c481724a7b10919ee420`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3274 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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