PDF malware analysis — malicious · 07b248caf1f7f0a5

MALICIOUS

PDF

35.5 KB Created: 2009-05-01 21:21:45 Authoring application: tvEeSFCPx (via NeTSnrx)

MD5: 631b7aeb1c2a3babb46f3a3f0f02a2ff SHA-1: b05695e3771c7a468b7d70a1a11a720be5ade108 SHA-256: 07b248caf1f7f0a5abbb9ed93ba9e97f8eaa884be685e7e8c115f4344e1128c9

188 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains heavily obfuscated JavaScript, utilizing eval() and unescape() functions, which is a common technique for exploiting PDF vulnerabilities. The embedded JavaScript streams are likely responsible for downloading and executing a secondary payload, as indicated by the PDF_JS_EXPLOIT_CLUSTER heuristic. The ML classifier also strongly suggests maliciousness.

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `8c64855d9e28494fc7466e662b4b3bb9f7e9a1abb3452208cc87e947eaf28033`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35126 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `f2715fb083a4423073c3471b50622cc648f9eefc979d04bd517f07a1498d96f8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x215	35039 bytes

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