PDF malware analysis — malicious · 10fcb782f09fc37a

MALICIOUS

PDF

76.5 KB Created: 2010-03-11 18:18:58 Authoring application: cVVuOiHjNy (via I8Y9PYQ9Dzb)

MD5: 9acd9332415183450f2014e71493d643 SHA-1: e890d51b4380b5328b8271f9a23e200ebcc4a091 SHA-256: 10fcb782f09fc37acb4c0e4bf1ed976f75ad3580e10ccee45cd6946d53fb28da

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical PDF_JS_EXPLOIT_CLUSTER heuristic, combined with PDF_EVAL and PDF_FROMCHARCODE firings, indicates the presence of obfuscated JavaScript designed to exploit a PDF vulnerability. The embedded JavaScript stream, named javascript_obj0007_000.js, likely serves as a downloader for a second-stage payload. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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` `9e025ed505f189518f8501ec06546185d73ac2e8133a880c95b340c2b43749b4`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23C	77110 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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