PDF malware analysis — malicious · 1538499d993ee201

MALICIOUS

PDF

13.9 KB

MD5: 46acee87f54263e1a5ab681138e58ce5 SHA-1: 651bd7c25d93ee800842596562a9ed9998c90d81 SHA-256: 1538499d993ee2018a21a5a91d5c8b67f80d6a2f49d99f41dedf99d8a661de20

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript streams that utilize obfuscation techniques like string concatenation and `unescape()` calls. The script attempts to reconstruct and execute further JavaScript, likely to download and run a second-stage payload. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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
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_obj3332_000.js` `6d2c5951088e55177160db39ffbef53ed408932dd18c020d523d599702d4adbb`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x35EE	341 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj3332_001.js` `8474c2d6fe330f502ae8cc5973848dc2e27aafc19ff549e837267281e6e88ad4`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x3620	405 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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