PDF malware analysis — malicious · 833d7bc908812731

MALICIOUS

PDF

4.5 KB Created: 2008-31-20 53:85:00 Authoring application: 1955 (via 1955 5.1)

MD5: 133af90b99b3f68234dd49a9d5821a89 SHA-1: 2584d4ec3b841b693ee4c3b1dc068b0f11384140 SHA-256: 833d7bc90881273198e6c7165291c137e94f3aaa0d88ca60b05765212f986ba5

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains obfuscated JavaScript that utilizes eval() and unescape() functions, indicating an attempt to hide malicious code. This script is likely responsible for downloading and executing a secondary payload. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of an exploit-based attack.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj0013_001.js` `6a8597d564c6ed7d187fcf89f25f322cbaf6e05ba3cc4ccdc683c3045badbffc`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D4	70610 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.