PDF malware analysis — malicious · 9c1f2ed5652dd68f

MALICIOUS

PDF

118.8 KB

MD5: 7e848f7ca9eda12ac53e2b88201cb91a SHA-1: 0a0f3d7b34ee02f37fe6dc967a1d0f97db93dc16 SHA-256: 9c1f2ed5652dd68ff90dcbec5e2e1207fcbe04f8461917545a4b28dbff76ee2d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript

The PDF contains embedded JavaScript, including obfuscated code with eval() calls and String.fromCharCode usage. Heuristics indicate a large comment-padded JavaScript eval stager. ClamAV detected this as Pdf.Exploit.Agent-36086, suggesting it's a known exploit loader. The primary attack pattern involves leveraging JavaScript within the PDF to execute malicious code, likely for exploitation or downloading further payloads.

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` `82413d2adf4bd4500f0fa61a86dfdc9d1a8cc545b8df6dadb7bc7a5b27b2e581`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	628061 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` `966128f689e3e0162f48c6d06e9f92e279238493f79003c818dcfcf860f502de`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 561 long base64-like blob(s).

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