PDF malware analysis — malicious · 5d5fd421b630b35a

MALICIOUS

PDF

14.8 KB

MD5: 090d5f44f9a3f5797ed68fc67aea55c4 SHA-1: c98815787eb2f1d3e58b8164209555dd04b58dbe SHA-256: 5d5fd421b630b35aefac2479fd4f4fa33f77f5ed39fcc4579c90de8fd0dece98

208 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is heavily obfuscated and utilizes the `unescape()` function, indicating an attempt to hide malicious code. The ML classifier and ClamAV heuristics strongly suggest malicious intent. The script's primary function appears to be downloading and executing a second-stage payload, as evidenced by the obfuscated code and the presence of a JavaScript stream.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0006_000.js` `eebd6f251b8a67250e3728898124f3f168737f5b0da5f8ea7f646dac37235d6a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1B1	15754 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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