PDF malware analysis — malicious · 07508fd342df7951

MALICIOUS

PDF

33.0 KB Created: 2010-02-04 17:18:49 +03:00 Authoring application: sureIn (via 89e3b2c88ef35d68afff6abeb34bec4c)

MD5: 7f42fef3d8a29a616c4bb4982c3e19fa SHA-1: 7b3d85300bf82606b533b88b1d7fdeba21e33dbb SHA-256: 07508fd342df7951309df6f6e9ecb12e02266cab6de2e80a1859e6c4c9a1b07f

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that utilizes eval() to execute obfuscated code. This JavaScript is designed to exploit a vulnerability within the PDF reader, leading to the execution of a second-stage payload. The ML classifier strongly indicates maliciousness, and the presence of exploit cluster heuristics confirms the exploitation attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 7

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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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_obj0012_000.js` `f4a3650d0c1513c40b9238a957f73e0f0d91c2d0230d22e641c842f561f2b274`	pdf-javascript-stream	PDF /JS object 12 at offset 0x1840	36505 bytes
`javascript_obj0014_001.js` `ab4cf7a8f544585736ac36781cb6b6b20cbdeff15eafae123f0aa021b69921d4`	pdf-javascript-stream	PDF /JS object 14 at offset 0x78D3	1675 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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