PDF malware analysis — malicious · 1308256f02595f5f

MALICIOUS

PDF

1.95 MB Created: 2009-11-11 18:10:42 +03:00 Authoring application: bcComesMore (via b219f59c2dd596abfadbcecfc2277659)

MD5: 8aa2e32516783d3c749f65a8abdb2dcd SHA-1: ec264781c5a15cdd98ea6c4b061938427fdfd9ee SHA-256: 1308256f02595f5fd061d2bb6e2fe34d582d202379c8f44465329787fc7b3b0f

154 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that utilizes an eval() call, a common technique for executing obfuscated or dynamically generated code. This JavaScript is likely responsible for exploiting a vulnerability within the PDF reader to download and execute a secondary payload. The ML classifier strongly indicates maliciousness, and the presence of JavaScript exploit cluster heuristics further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 5

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.
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0023_000.js` `f37708ff70ebd7d6a32559faddcbe2ccdf64cca208250ff0a1a68218f4b532a1`	pdf-javascript-stream	PDF /JS object 23 at offset 0x36D1	4096 bytes
`javascript_obj0024_001.js` `b48fa8415f88f4de07311eb80d00092d07218f400e13b59496acbe06283492cb`	pdf-javascript-stream	PDF /JS object 24 at offset 0xC68E	39 bytes

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