PDF malware analysis — malicious · 674985de071d25f4

MALICIOUS

PDF

4.3 KB

MD5: 9dbc77b43279f1343a23af4fcf47519d SHA-1: a7a474eae70ca992b4775bb3dfb2e0f975dadc08 SHA-256: 674985de071d25f430629c9d4b4a04ecd163808a2c2b05af7127db94f91ce6a4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1059 Command and Scripting Interpreter T1203 Exploitation for Client Execution

The PDF file contains obfuscated JavaScript code that utilizes eval() and String.fromCharCode(), indicating an attempt to hide malicious functionality. The script is designed to download and execute a second-stage payload, as evidenced by the heuristic firings related to JavaScript exploits and ML classification. The specific obfuscation techniques and the lack of clear indicators for a known family lead to an 'unknown family' classification.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj186457_000.js` `2a466af09f3e417a88a3cf94fa126f93f860fecaf53e2256b3a9fecce8feac83`	pdf-javascript-stream	PDF /JS object 186457 at offset 0x137	8297 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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