PDF malware analysis — malicious · c98d9e37b4aa63c6

MALICIOUS

PDF

14.8 KB

MD5: 28998d795563413e1b2c8fd6e44c6ee0 SHA-1: 0c7b98a78cbb1c72ea3ae3593cf00c1aa35e84d6 SHA-256: c98d9e37b4aa63c604b39de8fa67fb409620f4031317943a7c9255bae6708639

194 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams that are heavily obfuscated, utilizing functions like eval() and unescape(). These obfuscated scripts are indicative of malicious intent, likely to download and execute a second-stage payload. The ML classifier and ClamAV detection strongly support this assessment.

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` `f4b597d18a503282ea2a12aca65cea0e43bcc3bbf24e4650949cbc5d30be785d`	pdf-javascript-stream	PDF /JS object 116 at offset 0x4BB	37059 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 208 eval/decoder/string-building token(s).
`javascript_obj0123_002.js` `d1d5a3b188e4b7a5fc65799406a1350612f0abb0799bcd1148d4c105561fc784`	pdf-javascript-stream	PDF /JS object 123 at offset 0x386	14214 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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