PDF malware analysis — malicious · 171db561f5416e94

MALICIOUS

PDF

2.7 KB

MD5: d0d2fd0f56c8330bb021209caf0903a9 SHA-1: e522b6f7f0ca486e77aa356eb8530238a6238da5 SHA-256: 171db561f5416e946a88a9122757ee177cdf2367085aabef18045aaf5ba081bf

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains obfuscated JavaScript that utilizes an eval() function to execute a decoded payload. The JavaScript is designed to download and execute a second-stage payload, as indicated by the PDF_JS_EXPLOIT_CLUSTER and PDF_EVAL heuristics. The ML classifier also strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `f75b427a8a1551cbdc398bc15c9b2dea7a182259bc896da17e2eaee67900f060`	pdf-javascript-stream	PDF /JS object 7 at offset 0xDB	21133 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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