PDF malware analysis — malicious · 163fcdc6344c7b34

MALICIOUS

PDF

4.0 KB

MD5: 068eb56186ca8acc69fd2f5233eed58c SHA-1: eab3cdd4b5643653b52ab628111ae3d44b66d8a0 SHA-256: 163fcdc6344c7b34148813343eff295fcbca43e5cbfc50fcea0dadc77a461309

166 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 that is designed to decode and execute a payload. The script reconstructs the string 'replace' and uses it to decode a subject string, which is then executed. This indicates a malicious intent to exploit vulnerabilities or deliver further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

Annotation subject percent-decoding eval stager critical PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER

OpenAction JavaScript forces annotation enumeration, reads an annotation /Subject payload with getAnnots(), rewrites marker bytes into percent escapes, decodes it with unescape(), and dispatches it through eval. This is a high-confidence exploit-kit staging pattern. It is intentionally not mapped to CVE-2009-1492 unless getAnnots() itself carries the crafted integer or long argument shape for that vulnerability.
ClamAV: Pdf.Exploit.Agent-36062 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36062
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_obj0007_000.js` `068944f8c011a88ab770b45c6de142b9305a1f515d410204d5eadd9ac2b5bfb3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A2	373 bytes

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