PDF malware analysis — malicious · bcdc08ab5ebf3a58

MALICIOUS

PDF

22.4 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 997c4bb39d0748103494cbd9f8497c73 SHA-1: d034b4e04c4ebd4ca4deb7a3e6e38bfa41ac1a4c SHA-256: bcdc08ab5ebf3a58b724797d8adeca28f88d59eff2a84d841426cfe400c3e45e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged it as malicious with high confidence. The JavaScript stream, named javascript_obj0001_000.js, is likely responsible for downloading and executing a second-stage payload, as suggested by the use of eval() and the ML classification. The presence of String.fromCharCode further points to obfuscation techniques commonly used in malicious scripts.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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_obj0001_000.js` `57ec17e7fd7d27045e220a28d89a02788cd5d0c0c8e6f3d84f99b4b243eab86a`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	527 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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