PDF malware analysis — malicious · 9e06c37e9487fc19

MALICIOUS

PDF

15.7 KB

MD5: 36700ac79ee35e2ba06144120d8a975e SHA-1: ce3a9f6e8fd018ad8cb86da7ec0b0dfb83b2955d SHA-256: 9e06c37e9487fc192873481994f2b72108db0b149b302508e0165de963478cf0

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode(), indicating obfuscated code execution. Heuristics like 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' and 'CLAMAV_DETECTION' with the signature 'Pdf.Exploit.Agent-36086' strongly suggest this is a malicious document designed to exploit vulnerabilities or trick the user into executing a payload. The primary function appears to be downloading and executing a secondary stage.

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` `8a82494d012d8efe6580fd5b3c84ebd809270c391d09a7a781a3247c0c3a7847`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425224 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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