PDF malware analysis — malicious · 76c51e3eceb84ad0

MALICIOUS

PDF

4.4 KB Created: 2010-04-23 06:59:32 Authoring application: Dakmiyfomimaba

MD5: 9a45b323420ac366b38cefd5b2613429 SHA-1: 4d528a2ce21212822e1530b48b58ac78b9e0faa8 SHA-256: 76c51e3eceb84ad06ef338e4d2ea47b45e10d23aae83703aadba68f60bed66c4

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics as a stager. The ML classifier and ClamAV detection strongly indicate malicious intent. The JavaScript is likely responsible for downloading and executing a secondary payload, as suggested by the 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic. The ClamAV detection name 'Pdf.Dropper.Agent-7274007-0' further supports this dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7274007-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7274007-0
Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER

PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0010_000.js` `77692aa6eee912f470430c71119e8b9c8ba346a577cd63ae147470c7ef4ca3c3`	pdf-javascript-stream	PDF /JS object 10 at offset 0xC9D	896 bytes

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