PDF malware analysis — malicious · ef2fbab415f4e48f

MALICIOUS

PDF

118.7 KB

MD5: bd3c465c628c4a69ca9f21f2e04e46a4 SHA-1: 2081184458fb45f82e6d3619e9c82a50fa7b7611 SHA-256: ef2fbab415f4e48f61693ac297065e9f731d9284f77488d79ff14d8ccda338c1

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript with multiple eval() calls and String.fromCharCode usage, indicating obfuscated code execution. ClamAV detected this as Pdf.Exploit.Agent-36086, strongly suggesting it's an exploit loader. The presence of a large, padded JavaScript eval stager further supports this. The exact payload and delivery mechanism are not fully discernible due to obfuscation, but the intent is clearly malicious exploitation.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `611e7a84c26b34733a68266f3e0d6a6390d7639318f96cb42d47bcfef8507f5c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627313 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).

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