PDF malware analysis — malicious · cb3ae8153eaf0d2f

MALICIOUS

PDF

118.4 KB

MD5: f66898f4985d5505cde07c03b4f2dce5 SHA-1: 17a871f5ae591332726ace4a6d11d1e9a8b1c6b7 SHA-256: cb3ae8153eaf0d2f65ffcfd725f5ccb38304d74d5e0fc82903add522653d6938

196 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, including eval() calls and a large comment-padded JavaScript eval stager. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript stream, although obfuscated, is the primary mechanism for delivering the malicious payload, likely involving the download and execution of a second-stage artifact.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `ca02e6e197fd6b60d9ba6beed43ca453f3010fc9cb059edd7d7ead55522a49da`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626393 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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