PDF malware analysis — malicious · bb4d4f563f8e7313

MALICIOUS

PDF

14.9 KB

MD5: dab171d9ad2be6c778f7f31e510b8722 SHA-1: d1d8289f2744e852486f663a8f9457995f4b9f56 SHA-256: bb4d4f563f8e7313a995e68ce5f305e3b8d1cd8046e58ce127c88a18159049e1

194 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file exhibits multiple high-severity heuristic firings related to JavaScript execution and obfuscation, including PDF_EVAL and PDF_UNESCAPE. The presence of embedded JavaScript streams, specifically 'javascript_obj0116_000.js' and 'javascript_obj0123_002.js', strongly suggests that the document's primary function is to execute malicious JavaScript. This script is likely designed to download and execute a second-stage payload, a common technique for malware delivery. The ML classifier also flagged this PDF as highly malicious.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0116_000.js` `1c342b4be1be737b5d7a26c921e283d00b02605807b9c089e85d1e001a18973b`	pdf-javascript-stream	PDF /JS object 116 at offset 0x4BB	40444 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 195 eval/decoder/string-building token(s).
`javascript_obj0123_002.js` `c78c6877a8450b2ab3dec50a4c8680860870079aa01134a8643dd56e36014209`	pdf-javascript-stream	PDF /JS object 123 at offset 0x386	14342 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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