PDF malware analysis — malicious · f38143d6cc152605

MALICIOUS

PDF

118.5 KB

MD5: 6157c5a8e5b37a8879c923da49cb1def SHA-1: deccf19827cc2a9bd62a8c6e417bcb1e2597d4c3 SHA-256: f38143d6cc152605f3ece2e69651f2c49e0d9cb1f42bcf5154edb7aca0135e24

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a high-severity heuristic for a 'Large comment-padded JavaScript eval stager'. This indicates the script is designed to deobfuscate and execute further malicious code. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this is an exploit document. The presence of JavaScript actions and eval() calls points to the execution of arbitrary code.

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` `c8974587f3a229c11316f79fed139f183795ccbbc020ea5f1e205e3a06c24ef1`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627404 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` `8b36a2f4628d5a1194c3ce2a6006ec0596301db13858c9a5417c7e98ef0cef07`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 572 long base64-like blob(s).

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