PDF malware analysis — malicious · 003d8179611f91b3

MALICIOUS

PDF

3.9 KB

MD5: 34f43c93067c97aa745a142cfee2a1c6 SHA-1: 37db7d73b34692b8d9233439f7a38861771037cf SHA-256: 003d8179611f91b3cc6f8b27d1eedbb568c1a379b24a373b1711cacd98a4ae20

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1027 Obfuscated Files or Information

This PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode() functions, indicating obfuscated code execution. The script appears to be designed to download and execute a second-stage payload, as suggested by the exploit cluster heuristic. The specific URLs or commands are heavily obfuscated within the script, preventing direct extraction of further IOCs.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `1443f1ea7b930a8035f6a40975cb23f618c167ef9a0ded0fd9cf8fb359764736`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `18e5fdccd07c1cd76c1f11f42682873e1080ee729ccdaf5f7423b4b1abfa2a85`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x269	5465 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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