PDF malware analysis — malicious · 19911c1036d39685

MALICIOUS

PDF

10.8 KB

MD5: 2a1cb3472d3a5a283275d5d3f5b7a28d SHA-1: 947ce06f5972af6b59d6e33b19b8dbd6f18456da SHA-256: 19911c1036d39685e0368e49872c36eecebaa2a2527ade37e458a7b2a2c08e12

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The presence of unescape() suggests obfuscation of the JavaScript payload. The extracted artifact 'javascript_obj0007_000.js' is likely the obfuscated JavaScript code. The primary function of this script is presumed to be downloading and executing a second-stage payload, a common technique for malicious PDFs.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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_obj0007_000.js` `94b6cedede5b866fe094b3e557d33dc889f8edde8d7df9679251c7e62b2414ec`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	48509 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 240 eval/decoder/string-building token(s).

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