PDF malware analysis — malicious · e4a0011b02c1b3ff

MALICIOUS

PDF

118.7 KB

MD5: 75afdbbae1c0df02b17be50abbc458b9 SHA-1: 9f6be546ef134789ac9aed45d387f06d852481a2 SHA-256: e4a0011b02c1b3ff00f619c6617ad2cd6e89e1b72a412578f7359bd9ea62c74b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large comment-padded eval stager and multiple eval() calls. ClamAV identified this as 'Pdf.Exploit.Agent-36086', indicating it's a known exploit. The JavaScript is heavily obfuscated, but the presence of eval() and fromCharCode suggests dynamic code execution, typical for exploit delivery. The primary attack pattern involves leveraging JavaScript within the PDF to trigger an exploit.

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` `fd4e634f813026cca0902b744348cb04b2bbb39eea658d49e21ae5f3eeb56ff9`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626926 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` `dcd87d9a35e5e81e9b74f93a37a9c20ca2e5432c28cb41d702b3c404829e0e88`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 547 long base64-like blob(s).

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