PDF malware analysis — malicious · 6df975d23da94ccb

MALICIOUS

PDF

31.4 KB Created: 2010-01-25 15:05:09 +03:00 Authoring application: wordsHiddenWord (via 43a7c24e2d1fe375ce60d84ac901819f)

MD5: e894f9bb8812b007b24e12527f20a952 SHA-1: ed774ad1cd0af9869e6975256a1ac0451cc8784f SHA-256: 6df975d23da94ccb575180936a533cd068abf3e09bd971d71a02cd3ddae990cb

164 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 heavily obfuscated and utilizes eval() calls, indicating an attempt to hide malicious code. The ML classifier and heuristics strongly suggest this is a malicious PDF exploiting a known cluster of JavaScript vulnerabilities. The primary function of the embedded scripts appears to be downloading and executing further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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` `e309bc5591acf42834a1205f7657498ed1416534dca0b6ca61f699c3a7188663`	pdf-javascript-stream	PDF /JS object 12 at offset 0x1617	35839 bytes
`javascript_obj0014_001.js` `0d9c864683a808e47614ba99b1f365d065e98a233bc8f4c8e199a3fddd8ad268`	pdf-javascript-stream	PDF /JS object 14 at offset 0x717C	1954 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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