PDF malware analysis — malicious · 5efc79f61e63047d

MALICIOUS

PDF

32.0 KB Created: 2010-01-29 18:13:25 +03:00 Authoring application: overMore (via db92254e80a05b411642bc6885748637)

MD5: 2c8c4ccb3d930b7db3346f2d07b658b3 SHA-1: eb468ad2209408a181d42c73314bb8af44b9ea25 SHA-256: 5efc79f61e63047d97b17081f66f89ff316860b41f4eb4d44647256826e2f8b4

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 utilizes eval() and obfuscated code, strongly indicating malicious intent. The JavaScript is designed to download and execute a secondary payload, as evidenced by the heuristic firings related to JavaScript exploits and ML classification. The presence of obfuscated JavaScript and the exploit cluster suggest a downloader or dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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` `07d4c86fd48a3b69298a3e040dfc5e94e95f2ece8036ef392da3e64bbf5b915c`	pdf-javascript-stream	PDF /JS object 14 at offset 0x1974	34929 bytes
`javascript_obj0016_001.js` `b97a1cf1ea1b5c0286399887a50ad253bab31436d5f169d437e330c0c1c2d146`	pdf-javascript-stream	PDF /JS object 16 at offset 0x7460	1797 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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