PDF malware analysis — malicious · 60fcc3f2b277ff8d

MALICIOUS

PDF

12.9 KB

MD5: 215f823e5e728ea4355823efab6ac718 SHA-1: e2a91f253db9af55d10b6fb86caed92266a462ac SHA-256: 60fcc3f2b277ff8d42b396dc79feeb0c38b6e9d985c54a25bff7723aa4fcc020

146 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. The script utilizes string concatenation and evaluation ('eval') to construct and execute code, a common technique for obfuscation and payload delivery. The 'PDF_METADATA_EVAL_STAGER' heuristic specifically points to the use of metadata for staging malicious actions. The script's purpose appears to be downloading and executing a second-stage payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' score and ClamAV detection ('Pdf.Exploit.Dropped-94').

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` `719fe86d426b2b9dc460dfd388e1e9352417d55d8dbba3cfe8de3abbec658155`	pdf-javascript-stream	PDF /JS object 76 at offset 0x315C	331 bytes

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