PDF malware analysis — malicious · 05873e4611cefba5

MALICIOUS

PDF

12.4 KB

MD5: 4775b059b7d8ce9b1605612f813232a8 SHA-1: f7b7b350409f4ab7e84cc3b406c689a7caf25fb8 SHA-256: 05873e4611cefba5974f4a46ced9fde9457b95fec7ef36e2dccbf338f440f2ed

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript within its metadata, which is designed to decode and execute a stager. The JavaScript function `test2` and the loop iterating 3842 times suggest a complex decoding mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for delivering a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
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_obj0076_000.js` `56435f6e58823add13676166d030389f1f8f07d21284404c8283c099512d096a`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2F5C	331 bytes

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