PDF malware analysis — malicious · 70fb699a85fb0b98

MALICIOUS

PDF

17.7 KB Created: 2010-03-16 05:18:43 Authoring application: qLaFYEbFR (via nPv5pqd)

MD5: a14956fab87e6ff461f0261c4111d778 SHA-1: 77682e4652d44636cc7af8fc7d0fb007e39227c8 SHA-256: 70fb699a85fb0b982bac537b01cff0222f61e5bba57fbe47981281987c53d5dd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and a critical PDF_JS_EXPLOIT_CLUSTER. The JavaScript uses String.fromCharCode and eval() calls, indicating obfuscation and dynamic code execution. The ML classifier strongly suggests maliciousness. The primary purpose of the script appears to be downloading and executing a second-stage payload, as evidenced by the exploit cluster and obfuscated JavaScript.

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.
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` `bce6a7ef4db84908aff62607ab45d0d5a8a6d7a5336d05c1f5f6f79ce735521d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x246	16876 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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