PDF malware analysis — malicious · 9ba585ed37beaaa0

MALICIOUS

PDF

118.6 KB

MD5: 1ed0ec09532b8c777af6f03dfc02d1cf SHA-1: 30713dcacd3452113a89e39122f9575e93fc15a4 SHA-256: 9ba585ed37beaaa0b555e14aea7b168980cbdaa7d7fe4ec9c9896c4cd3d246fe

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file exhibits multiple high-severity heuristic firings related to JavaScript execution and obfuscation, including `PDF_EVAL` and `PDF_JS_LARGE_COMMENT_PADDED_EVAL`. ClamAV also detected it as `Pdf.Exploit.Agent-36086`. The embedded JavaScript stream, `javascript_obj0006_000.js`, is large and heavily obfuscated, suggesting it acts as a stager. The primary function of this script appears to be downloading and executing a second-stage payload, which is a common technique for malware delivery.

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` `1398882933b2ded33d534b43d07da3faf517c74dac5938e0b8743dc6406dd731`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627473 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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