PDF malware analysis — malicious · 226ea99a9c5d3186

MALICIOUS

PDF

15.7 KB

MD5: 9f25da695b3005db6569ac1a7e9f6133 SHA-1: c477f8795766d1367fba1cfb8982bfbc99475226 SHA-256: 226ea99a9c5d31865c66104d567243a142f6b07ad4473e731087afd202b637c1

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript, including calls to eval() and String.fromCharCode, indicating an attempt to obfuscate and execute malicious code. Heuristics suggest a large, comment-padded JavaScript stager, and ClamAV identifies it as Pdf.Exploit.Agent-36086. The embedded JavaScript likely downloads and executes a second-stage payload, though the exact mechanism is obscured.

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` `2f3e61413f23a9b995a2bc278180253c1ee76ab32bf3a13353524a2ded60b991`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425105 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` `fc31fbf676686d2fbf0330ee9e8cb7e58660ce3877094ec204172e4ed5720594`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 773 long base64-like blob(s).

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