PDF malware analysis — malicious · 1018f1a3645d32f4

MALICIOUS

PDF

9.6 KB Created: 2011-12-13 00:36:11 Authoring application: TncSp9qWsINEBl (via JudD4)

MD5: 33a48f3b692ecc82ec59e2651852992b SHA-1: c19424e3f52cc69f3820b46fe91bb23922b744e8 SHA-256: 1018f1a3645d32f4a8c42044bcff653726dcd4585c47d07370217b2c4e8892d3

148 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, but static analysis indicates the use of eval() and exploit cluster heuristics. The script likely attempts to download and execute a secondary payload, a common technique for initial compromise. Given the PDF format and the nature of the exploit, it is highly probable that this file was delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `5a17d722b8f85630a765a3064f7a599a6db59711fb8a8ce04ca715591f37dd18`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23B	8369 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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