PDF malware analysis — malicious · 63f336b71aec7f1b

MALICIOUS

PDF

5.1 KB

MD5: 5baaf9fd6023234286a1588c27e253ed SHA-1: 4bed5d57e5fde6f03d338d63c8bd9b3b4fcae073 SHA-256: 63f336b71aec7f1b21c58935b57a60a1ea9b9d7738320fb1052bb705286d5f75

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains obfuscated JavaScript that utilizes eval() and String.fromCharCode() to decode and execute a payload. The script appears to download a second-stage executable from a hardcoded URL. The ML classifier strongly indicates maliciousness, and the heuristics confirm the use of JavaScript exploits.

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)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj63810_000.js` `546d1087e8bbb9aa1bd43ffba2dbddd9e96f5157b97d377d99f42a7d2df81a72`	pdf-javascript-stream	PDF /JS object 63810 at offset 0x137	8367 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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