PDF malware analysis — malicious · 658b62088dca127a

MALICIOUS

PDF

9.6 KB Created: 2009-02-19 14:45:49 -02:00 Authoring application: Writer (via OpenOffice.org 3.0)

MD5: 22fcc83b76496bdf2eaa923cb3eb9c79 SHA-1: 38e06ad591f307f3001d648ab7cf5e1a27fcd88f SHA-256: 658b62088dca127a7f55367d969244d505fba5b669ca4b159bc284267c62795a

188 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is obfuscated and uses eval() to execute malicious code. This JavaScript is likely responsible for downloading and executing a secondary payload, as indicated by the PDF_LAUNCH and PDF_JS_EXPLOIT_CLUSTER heuristics. The ML classifier also strongly suggests malicious intent. The specific JavaScript code is too obfuscated to determine the exact download URL or execution method, leading to a slightly reduced confidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
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_obj0027_000.js` `2780e40622cf2660e117833632cc884040db5b83ef49ae7587ae3323bfd83f7a`	pdf-javascript-stream	PDF /JS object 27 at offset 0x1C1B	3265 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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