PDF malware analysis — malicious · 71f0aeb2f59e75a4

MALICIOUS

PDF

71.7 KB Created: 2010-03-15 13:18:34 Authoring application: uUXWWr (via zeEUN7)

MD5: 933715eecd513349672c701892420f68 SHA-1: 5d10124c499e2ea682f78e259d107505ced97841 SHA-256: 71f0aeb2f59e75a427d33352848e56c62f223580ea580989554b198e61d8c8f3

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()` functions, indicating obfuscation and a high likelihood of malicious intent. The critical heuristic 'PDF_JS_EXPLOIT_CLUSTER' further supports this, suggesting the script is designed to exploit vulnerabilities. The primary purpose appears to be the execution of a secondary payload, as evidenced by the embedded and obfuscated JavaScript.

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.
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_obj0007_000.js` `5d5ce864b30915343cbf0ad6e1d3d223efc4be5a4a41ef5927b944d785c70d83`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23E	72166 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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