PDF malware analysis — malicious · a53d872bfb7975a5

MALICIOUS

PDF

3.1 KB

MD5: af64f5a66a7fda04517b8991194b6480 SHA-1: 2171beff9428524dfb01542c39a12c6a0f5ebf7e SHA-256: a53d872bfb7975a5fe5cf2bee6c3cacfba1db79af2974d448978620fa90c8e6d

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including ML classification and ClamAV detection for obfuscated objects. The JavaScript stream, named 'javascript_obj0006_000.js', is likely responsible for executing malicious code. The ML classifier's high score indicates a strong likelihood of malicious intent, possibly involving the download or execution of a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 5

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` `4c83e789e2c7531fbdb36ba38192d2abb8e3d1f83a6a97367929a38af14a6851`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1B2	1886 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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