PDF malware analysis — malicious · 054cb1648b252b38

MALICIOUS

PDF

47.9 KB

MD5: 464bac018a0b6beb23c2f285471a085e SHA-1: 740973b64f377f5e5f61e8b4899af3de39aba91a SHA-256: 054cb1648b252b382b64e9337055641eb3b77bcb6b5c23c49ee20e2ea888bf9b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes `eval()` and `String.fromCharCode()` for obfuscation, a common technique for exploiting PDF vulnerabilities. The ML classifier strongly indicates maliciousness. The embedded JavaScript file, 'javascript_obj0009_000.js', is the primary artifact, likely responsible for downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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_obj0009_000.js` `9419e47b0c0d397f6ce943f40d8a28520115d7eb8a4eeef53466694f561e3876`	pdf-javascript-stream	PDF /JS object 9 at offset 0xA124	48592 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 13 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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