PDF malware analysis — malicious · 6e0730dbc2431b86

MALICIOUS

PDF

24.3 KB Created: 2010-02-11 13:25:35 +03:00 Authoring application: overMore (via 660bc121513a9d5442e97c5cef85786e)

MD5: 95853004cbc30b36f3804e40e0828301 SHA-1: 4e4c754382d3d03faecb246ac616e2495b2a00b5 SHA-256: 6e0730dbc2431b86b162649a77dc23e1a7842dd29dc0e69fa9f2f295c4b1a414

172 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and a critical PDF_JS_EXPLOIT_CLUSTER. The JavaScript streams, particularly 'javascript_obj0014_000.js', appear heavily obfuscated but contain calls to eval() and string manipulation functions, strongly suggesting the execution of malicious code. This code likely downloads and executes a second-stage payload, a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

Heuristics 8

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. (matched inside decoded stream)
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_obj0014_000.js` `c35a5de4af4e0d7de4303a557587d217a6865a39217508af6bf34bfb75266487`	pdf-javascript-stream	PDF /JS object 14 at offset 0x18D8	32814 bytes
`javascript_obj0016_001.js` `b2d00daec5e3fa91bc1eaf746413e8704fb8bc21c965d8a116ab563249f432c1`	pdf-javascript-stream	PDF /JS object 16 at offset 0x5528	1756 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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