PDF malware analysis — malicious · b2f3eae212f07937

MALICIOUS

PDF

118.7 KB

MD5: 996fd6957929daa307ab4e573d0be890 SHA-1: c1fafb4d9419d8fb241d486228d1c5bb82ee14f5 SHA-256: b2f3eae212f079376dbb3e5dd854bcf217e2c0b50ba64342408f190b8a14ec1a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link T1566.001 Spearphishing Attachment

The PDF file exhibits multiple high-severity heuristic firings related to JavaScript execution, including eval() calls and a large comment-padded JavaScript eval stager. ClamAV also detected it as 'Pdf.Exploit.Agent-36086'. The presence of embedded JavaScript, particularly one identified as a potential stager, strongly suggests the file's purpose is to download and execute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to the lure.

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` `fd6148c0f0ba22d42c98eb0507d5be70f612122a1f31743bfe6e7364b588051a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627567 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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