PDF malware analysis — malicious · 67606a5f6a777787

MALICIOUS

PDF

9.5 KB Created: 2010-05-18 19:07:07 Authoring application: RfSWXNLc (via NvLDhV7)

MD5: 590d831c5bceae2616e352107b70522d SHA-1: eecd8d940ea22818332c90fb49fdbc94971eed6d SHA-256: 67606a5f6a777787dd8498911a3da48040a4af04ccf3c02c3a18fe77fee26e14

148 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that is heavily obfuscated and utilizes eval() calls, indicating an attempt to exploit vulnerabilities. The ML classifier strongly flags this as malicious. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the obfuscated string concatenation and the nature of PDF exploit clusters.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `240c343400cd403c29ca6aaede1aaf6f6b92036e9bd1167f31f6a5d0ab972b50`	pdf-javascript-stream	PDF /JS object 7 at offset 0x242	8236 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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