PDF malware analysis — malicious · 037b1bf232c69ccd

MALICIOUS

PDF

33.5 KB Created: 2010-01-19 14:52:59 +03:00 Authoring application: notGoodNot (via 8e1ad7941398486f8cede7799b886b58)

MD5: 17c7178a302be17789f6a064362d56fa SHA-1: 9fac706e835251f1121b31162b7b6476c241b333 SHA-256: 037b1bf232c69ccd8850d93fbaccde8745f21c9d94912c1b1abaf71cda537b4a

164 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains multiple high and critical severity heuristics related to JavaScript exploits, including eval() calls and an exploit cluster. The embedded JavaScript streams, particularly javascript_obj0016_000.js, are heavily obfuscated but contain eval() calls, indicating an attempt to dynamically execute code. This pattern strongly suggests the PDF is designed to exploit a vulnerability to download and run a malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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_obj0016_000.js` `eb23ab5f35fb642ad73152a60cbcbc4b7dd49373f93aeb2597c003f59bc499ab`	pdf-javascript-stream	PDF /JS object 16 at offset 0x1FBF	35307 bytes
`javascript_obj0018_001.js` `fb44f71fccda4a1d432cece30f5cb4cb2bacf9b14e77d79a6c862f0e73dba251`	pdf-javascript-stream	PDF /JS object 18 at offset 0x7A75	1594 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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