PDF malware analysis — malicious · 1b203cdca44ef66a

MALICIOUS

PDF

118.6 KB

MD5: efd13220842236d47d4a4eb7fe93a7f3 SHA-1: 69c84fe72b4b00efa9c7805084b21fcaf599f326 SHA-256: 1b203cdca44ef66a0f7958ec06d0c71ce13d91aa79e329469b876be48d58622f

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file was flagged by multiple high-severity heuristics, including ML classification and ClamAV detection as 'Pdf.Exploit.Agent-36086'. The presence of embedded and obfuscated JavaScript, specifically using eval() and fromCharCode, strongly indicates an attempt to execute malicious code. This script likely acts as a stager, downloading and executing a second-stage payload, which is a common technique for initial compromise.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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_obj0006_000.js` `5e74c0b358a6b274450207986fd292b9902855bf0950396d3fc2e74cf1f4a923`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627450 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `6df03741f6db8958eed34b5a45ca951b2b04d8603f37ba3f81c26bb775b5f976`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 591 long base64-like blob(s).

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