PDF malware analysis — malicious · dc65e04e33225822

MALICIOUS

PDF

118.5 KB

MD5: f644c1ecf888d090d0b2dfc95aab52be SHA-1: 32f55955c2848a89b5660251b41c67cbf62b53cb SHA-256: dc65e04e33225822edc9e092ec5a094f5e5a85b6a159c00dd57278cdbd48bd7e

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF was flagged by ClamAV as Pdf.Exploit.Agent-36086 and ML classifiers indicated a high probability of maliciousness. Heuristics indicate the presence of JavaScript with eval() calls and fromCharCode, suggesting code execution. The embedded JavaScript streams, particularly the large comment-padded eval stager, strongly suggest the PDF is designed to download and execute a second-stage payload. No specific family could be identified.

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` `215f08e6798ff3dadf49ac6203caac8d4cd7baed1eb28713f3a64ea72ef76c42`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626526 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` `a21838e62f7deab65199933c3a0bed40182dd7653607427413d8b93d6a21e6f3`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 518 long base64-like blob(s).

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