PDF malware analysis — malicious · 75e6a3f154ab27d8

MALICIOUS

PDF

12.2 KB

MD5: d40630329c5ca3bdc8bdec0b9e11f136 SHA-1: 75696e23f99be91ed4eadee716adbe2373ce4b8c SHA-256: 75e6a3f154ab27d8b474692e5107c8e416d65fb594064d1a3aa203aaa5a93eb4

192 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file exhibits multiple high-severity heuristic firings related to JavaScript obfuscation and execution, including eval() and unescape() calls. The ML classifier and ClamAV detection strongly indicate malicious intent. Two embedded JavaScript files were extracted, suggesting they are responsible for the malicious functionality. The primary attack pattern involves exploiting PDF vulnerabilities via obfuscated JavaScript to likely download and execute a secondary payload.

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` `43b1d78b34eebb79a185a8024cb398137d3f8b21a0f7ea06e0d19eec23e62da3`	pdf-javascript-stream	PDF /JS object 116 at offset 0x4BB	40492 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 207 eval/decoder/string-building token(s).
`javascript_obj0123_002.js` `e917819b28657e34f95e29328052ec36cef24a19b78a6fc2d69fdc2467fc8e26`	pdf-javascript-stream	PDF /JS object 123 at offset 0x386	11598 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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