PDF malware analysis — malicious · 42bca531b49311a3

MALICIOUS

PDF

118.7 KB

MD5: b109f384bc9528e24af565917555f3e8 SHA-1: 0ceb3cff7b72551f8fed28a8e2e5542ca8507720 SHA-256: 42bca531b49311a37d5fdeff19382f7781de71d9e7e7e1fb03ed31561752a9a8

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1059.007 JavaScript/JScript

The PDF contains embedded JavaScript, including a heavily obfuscated 'eval' stager. This stager is designed to decode and execute arbitrary code, a common technique for downloading and running further malicious payloads. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The presence of large, obfuscated JavaScript streams indicates a sophisticated attempt to conceal the malicious activity.

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` `9ac25e7b535c252b292222d3f24c86c7ff38271b0c3128c687d1d1d619a74dab`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627115 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` `e4a2938905d715ab23e96500f7c6e1d20d724c720906030495deb209e385d157`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 535 long base64-like blob(s).

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