PDF / .NET malware analysis — malicious · 08d72b1d6ba618d0

MALICIOUS

PDF / .NET

3.8 KB

MD5: 99f82dca1a006fdf4bf04c06cac89678 SHA-1: 7d14c5bfc53e7189a7e2f321466b640823068b3c SHA-256: 08d72b1d6ba618d048268667152a9b2fef21a30920e4b215030f18d1a4c9a409

116 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings related to PDF JavaScript exploits and string manipulation. The embedded JavaScript, though truncated, suggests an attempt to download and execute a second-stage payload. The ML classifier strongly flags this PDF as malicious, supporting the conclusion of an exploit-based attack.

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.
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. (matched inside decoded stream)
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_obj0036_000.js` `f0d39fac888bc85c78fb74e72842db3824cef8f9a4b8e5b7fa1a52e4a7e303e5`	pdf-javascript-stream	PDF /JS object 36 at offset 0xC5	16410 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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