PDF malware analysis — malicious · 014b095e9af8d66b

MALICIOUS

PDF

14.0 KB

MD5: 6c2bc7f14982a02814dd656bf303ac87 SHA-1: 2d3e0c0c1ce32d617d48f2c2416eb361251a54ef SHA-256: 014b095e9af8d66bf61d655caa7630a1e9be6a675d9bc3ea1544196db7009ced

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File

The PDF contains embedded JavaScript that utilizes `unescape()` and `String.fromCharCode()` to deobfuscate and execute malicious code. The script appears to be designed to exploit PDF vulnerabilities, likely leading to the download and execution of 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 0x363E	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 0x3670	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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