PDF malware analysis — malicious · 810306ed9b52261f

MALICIOUS

PDF

32.8 KB Created: 2010-01-20 15:14:03 +03:00 Authoring application: goingIts (via 5133aa1d673894d5a05b9d83809b9dbe)

MD5: ab60256944c967a8553bd1ba4dd0e37b SHA-1: 79136bdc3c121e6b28045e4e6be2b6140f2262ea SHA-256: 810306ed9b52261f0f01376f79f5a60c16cafd1689f46cc23e119ba466886aa8

164 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that is heavily obfuscated and utilizes eval() calls, indicating an attempt to hide malicious code. The JavaScript is designed to download and execute a second-stage payload. The ML classifier strongly flagged this PDF as malicious, and the presence of exploit cluster heuristics further supports this assessment.

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_obj0014_000.js` `6f45d0af8ef0ceb289576f99245a0a2621be733494bf5e3546565fffa14b5e2f`	pdf-javascript-stream	PDF /JS object 14 at offset 0x1D1E	35347 bytes
`javascript_obj0016_001.js` `5b32ecbc0f4f4372d243d3b570073fb6fc4c80d71c7a4636b50801ea4236414f`	pdf-javascript-stream	PDF /JS object 16 at offset 0x7840	1569 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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