PDF malware analysis — malicious · 7585078de408b0e4

MALICIOUS

PDF

12.0 KB Created: 2010-11-17 21:28:12 +03:00 Authoring application: XMhd_m (via e26fef)

MD5: 1db10251c88cb73c6062e42234a51523 SHA-1: 7b78e813b7603cef97b290c4e3a33c4d5ef8233b SHA-256: 7585078de408b0e43d2b82366da7de1762c61c541faf4419711cf7f9bec93e2c

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded JavaScript streams, with heuristics indicating the use of eval() and String.fromCharCode for obfuscation. One script, javascript_obj0015_002.js, directly calls app.doc.eval() with the output of other deobfuscated scripts, strongly suggesting it's designed to execute arbitrary code. This points to an exploit targeting PDF vulnerabilities for initial execution, likely to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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` `3ff057eee32e8ea14a010ae77b0664666a986dd6f1f6be65c50fcc66eed10a48`	pdf-javascript-stream	PDF /JS object 11 at offset 0x23C5	2411 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `c08239551b309c65d809854f7ce8fc292651d843c10d9fb7a498155586425651`	pdf-javascript-stream	PDF /JS object 13 at offset 0x2806	1092 bytes
`javascript_obj0015_002.js` `08ebc3d1fff647e843ee6897b90329481e3894fa715ace4d7da6f1b0eda40e28`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2A71	300 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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