PDF malware analysis — malicious · f184d979756b900c

MALICIOUS

PDF

118.6 KB

MD5: bc23891d85c7ce7ab62c68811316a1eb SHA-1: b191294196a12b719a4e6eea9abeac4bcf1e8071 SHA-256: f184d979756b900c96981c8f43fb2e35c14cdbe97a8f00d07e74a7bae53c5c4b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large comment-padded eval stager, which is a common technique for obfuscating malicious code. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly indicates this is a known exploit. The primary function of the embedded JavaScript appears to be downloading and executing a secondary payload, as suggested by the heuristic firings related to eval() and fromCharCode, and the presence of an extracted JavaScript file. The document body is heavily obfuscated and unreadable, providing no direct clues about 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` `a886fff3a0ba995a4a82075d55619705d9b5d9414580117d8dfba4110af67c22`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626655 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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