PDF malware analysis — malicious · b6071bf1bc718171

MALICIOUS

PDF

118.6 KB

MD5: b08b9c4cf009868d4f5f9b2016690e1c SHA-1: dce58a2e3b5806914be47ab8b7fa426277998644 SHA-256: b6071bf1bc7181718e6a6010fe4c9cd3b7b016567213b41eee90d073871cb46a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information

The PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. A high-confidence heuristic, PDF_JS_LARGE_COMMENT_PADDED_EVAL, specifically points to a stager designed to execute obfuscated JavaScript. The presence of eval() and String.fromCharCode further supports the obfuscation and execution of malicious code. The ClamAV detection 'Pdf.Exploit.Agent-36086' confirms the malicious nature. The primary function appears to be downloading and executing a second-stage payload, as suggested by the nature of the heuristics and the extracted JavaScript artifact.

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` `5e0dcf534ffc900c56781d84daca06c2e391154d5e05198d6aa602f10d621b1e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627141 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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