PDF malware analysis — malicious · 05bf96ee847eb43d

MALICIOUS

PDF

12.2 KB Created: 2010-08-25 22:49:07 +04:00 Authoring application: I0_V_AZ (via 7207cc49a)

MD5: 48b80431757fa8b3cd5db76e0efef2de SHA-1: 05a0a0552e5e9f81892ffedf2963264015646c52 SHA-256: 05bf96ee847eb43d6a3bd2ae74b43116bdc28da40d228d14b2b61348e45c3205

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple 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 a function that decodes and likely executes further malicious code. This pattern strongly suggests the PDF is designed to exploit a client-side vulnerability to download and execute a secondary payload.

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` `1252d82fad66efe9df62d1b3770e555ad5817316eb43b5bc365d40171235ec59`	pdf-javascript-stream	PDF /JS object 11 at offset 0x24A4	2385 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `27a5878c007bf652ef4573e07fd2ff9ec470e81e30af97b05acd9fcfcac686b9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x28E2	1087 bytes
`javascript_obj0015_002.js` `e4bad6a247779201245470f1ff3e4d2da9df81fc5d6f413e98b6a2011c86555a`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2B4B	329 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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