PDF malware analysis — malicious · 9a10e0f1e3882677

MALICIOUS

PDF

118.7 KB

MD5: 48f21157de9c20ca35f25f9e0bff5642 SHA-1: 42a58275fb74bb1ca39f3ffea0be25a061683936 SHA-256: 9a10e0f1e388267780549f32cc0ab0a813355ac19875950e13749c7129efd3d3

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including multiple obfuscated streams and a large comment-padded eval stager. Heuristics indicate the use of eval() and String.fromCharCode, common in JavaScript exploit stagers. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests this is an exploit delivery mechanism. The exact payload and execution flow are obscured by heavy obfuscation, preventing a more detailed analysis of the script's intent.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `9c9806ba40e3423915e426c4b483b91612887616e7d05f4f8e32c0f5bba87d51`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626869 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` `d49f4cf922b19ee385c105aa5c3da21b892039b095a3c5e648896561caa2a082`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 611 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `39d2843a716e5b2e82103cb3842c10e862521ffa80dd01cf59b567a3a38a14af`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 575 long base64-like blob(s).

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