PDF malware analysis — malicious · 2f4d36909c307c89

MALICIOUS

PDF

118.7 KB

MD5: e26faebf3389c346890906978806ec79 SHA-1: 9713faf79c4dc4577726701eab1a3582c2d5a43c SHA-256: 2f4d36909c307c8937da6628f41781d1b8d36b3f81b6c566e3e8d112dd623c79

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript. High-severity heuristics indicate the use of eval() and a large comment-padded JavaScript eval stager, suggesting obfuscated code execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, which is a common attack pattern for PDF exploits.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `bf6e66037547eed339afc527f22c322dd3e2882aaeb3752e23b4be5aa6af9a1d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627563 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).

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