PDF malware analysis — malicious · c3d44ff74394de2b

MALICIOUS

PDF

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

MD5: d29f6fcca6475111ecf8ce85ef5c132a SHA-1: cced2166127a1e5ea488783e8305186a55e99a09 SHA-256: c3d44ff74394de2bc2231779daebbdc3589a1728eb18b60990dc70b30618a78c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes `String.fromCharCode` and an `eval()` call, suggesting obfuscation and dynamic code execution. The ML classifier strongly flags this PDF as malicious. The primary intent appears to be the execution of arbitrary JavaScript code, likely to download and execute a second-stage payload, as evidenced by the embedded javascript_obj0001_000.js artifact.

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` `7a93c9989da7160eda328ed1b8ab8831334b2f4fb3abd6b17f1412e9af128cf5`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	525 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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