PDF malware analysis — malicious · 04a090fa5f6e5466

MALICIOUS

PDF

13.2 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe

MD5: 966074c38f84756fd6cff0a43700dcf7 SHA-1: 2447d5a8c74ef46912b9b8abeffb9798a007deb9 SHA-256: 04a090fa5f6e5466bc658a3a5b95ad4049cd2fb978993d5951b3eb0c2ab98c81

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains multiple embedded JavaScript streams, with critical heuristics indicating an exploit cluster involving eval() and String.fromCharCode. The JavaScript appears heavily obfuscated, but fragments suggest it attempts to construct and execute code, likely for downloading and running a secondary payload. The presence of exploit-related heuristics and obfuscated scripts strongly indicates malicious intent.

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. (matched inside decoded stream)
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `6a020441d0548b3308e20229f240b3fb35a23e638d09f213b6c03adcb42defa4`	pdf-javascript-stream	PDF /JS object 12 at offset 0x204A	4806 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `8210e999a0ba1fa00f8bf5abe1af57d8db9921062a38a4bced207ac023cb75aa`	pdf-javascript-stream	PDF /JS object 13 at offset 0x27CE	3426 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0014_002.js` `52071d5275a2e5f3cae2009a9b77f72235e5d1431259f6970d13c9eb2b0b7a40`	pdf-javascript-stream	PDF /JS object 14 at offset 0x2CB8	3870 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_000_off000001ae.js` `33927513ea9a233aad6c51a9f3c6ac0e454b46619ae5ee4b6ce46ba29511950d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1AE	133235 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.