PDF malware analysis — malicious · 14f4637e5ec4961d

MALICIOUS

PDF

7.4 KB

MD5: 484903743f22a8c4646d726e159ef71c SHA-1: 4f52d6a856487e290858659fee6c5f2d759dfaec SHA-256: 14f4637e5ec4961d24469f6cf33e61e8edf4d9e3e89debc4a43dbcf8c4fd8985

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode() functions, indicating an attempt to obfuscate and execute malicious code. The critical PDF_JS_EXPLOIT_CLUSTER heuristic firing further supports this. The script's primary function appears to be the execution of obfuscated JavaScript, likely to download and execute a second-stage payload.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `a41ad1d7fd95b1d08bfef821bbfa9bd636a4afc540ad13b384666b49aa1fe5e3`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	302 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001b91.js` `edbebdea2a78a3dad31a83eb2d2655a2e8fccf55ad84157213c33113dd1b3107`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1B91	309 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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