PDF malware analysis — malicious · 2c582059579c8361

MALICIOUS

PDF

2.6 KB

MD5: e2fec8ed23a15cecf6d17454fbf2e3c9 SHA-1: 73de9d3148e321cc1be0b9ed081e5ce080968647 SHA-256: 2c582059579c83613f967e91070d2d0abe40d4e7336a5dfe8a4341d4fb3e0ad5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1027 Obfuscated Files or Information

This PDF file contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode() functions. The ML classifier strongly indicates maliciousness. The obfuscated JavaScript likely attempts to download and execute a second-stage payload, a common technique for initial access.

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_obj111711_000.js` `4c2d6d0ec09c906e39469ec6a33175381075f076bd2cd6b754756150c882ad79`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	371 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `a854ec379579ef2347c9eff1be94ec56ea66e64a1943e38346e342a335bd733b`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x247	2949 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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