PDF malware analysis — malicious · d7a7dfa57008c425

MALICIOUS

PDF

8.2 KB

MD5: f35ff99a37e1b227d44305f7132ec8ed SHA-1: 8ee929316d84b22e3065d39847e3065d8666b9dc SHA-256: d7a7dfa57008c425bfe6aa739856de064791b34a22d1604ba5368c49ac5ec6c3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The JavaScript stream, named 'javascript_obj0013_001.js', utilizes eval() and String.fromCharCode, suggesting obfuscation to hide its true intent, which is likely to download and execute a secondary payload. The high risk score further supports a malicious classification.

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. (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_obj0013_001.js` `690cd8501a85c36389aa6e64f0c288e7fa883840cfb35a29c3c3996ffa7cc48b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	14580 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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