PDF malware analysis — malicious · 5ca7bb39e7a0dec1

MALICIOUS

PDF

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

MD5: 156793400fc73ac28975304c150aef53 SHA-1: b5a3497431a00ac613316025c50dbf07ad1bdc67 SHA-256: 5ca7bb39e7a0dec19995f477083f8ed5393bf7b8075a71fc32938ffc44b5dcde

156 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains multiple embedded JavaScript streams, with one stream exhibiting significant obfuscation and eval() calls, indicative of exploit code. The ML classifier strongly flagged this PDF as malicious. The JavaScript's obfuscated nature and use of eval() suggest it is designed to download and execute a secondary payload, a common technique for initial compromise.

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` `711aec209f628ee48381d5786ed64a402f7d090f7a8b1d1aa65ebefdb03326da`	pdf-javascript-stream	PDF /JS object 12 at offset 0x19DC	4038 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `4701d34d81e0af80a69709299ae8659fe815c495fdf45faba97c692930d865a0`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1FFB	4005 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0014_002.js` `1688f29fc6c7da6ed04378d4212cc803c9fc68c9c8910420646de02e1f4c8f5e`	pdf-javascript-stream	PDF /JS object 14 at offset 0x2601	2181 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_000_off000001ae.js` `fa160859acb1deb9ff4d5c8587f2c120c74fb284583a446deccc3b982f115a86`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1AE	129904 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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