PDF malware analysis — malicious · 73a72f9d6d8378dd

MALICIOUS

PDF

11.4 KB Created: 2010-12-25 17:16:42 +03:00 Authoring application: Q4vxTM (via a732804)

MD5: e12c56a379f54db3f969e8bd97cb18d5 SHA-1: f8bd9ad883f38d32f017277d01e1c24636e8e295 SHA-256: 73a72f9d6d8378dd7c25007bd7c09613ddf83a804ddbb28b783592dce7bfa824

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains multiple JavaScript streams, with one stream calling `app.doc.eval()` to execute deobfuscated code. The JavaScript appears to be heavily obfuscated, making it difficult to determine the exact payload. However, the presence of `eval()` and exploit cluster heuristics strongly indicates an attempt to exploit a vulnerability for code execution. The primary function of the script is to deobfuscate and execute a second-stage payload, likely a malicious exploit.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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)
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `bc38e153409359cc60f5bc81bb96191973bff96d7ba5179103f2af6984842c4e`	pdf-javascript-stream	PDF /JS object 11 at offset 0x245A	1107 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `f2f31bcac17db97b34ab155662b90412a4b35d273a167e1d9478cd8492cf063c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x26DD	506 bytes
`javascript_obj0015_002.js` `73a7c124ec9b2445850cc5c8d6deece9bfa7cc01eb47b4a668f72dbe621418d7`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2875	147 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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