PDF malware analysis — malicious · 0c11f6ffceb04e6f

MALICIOUS

PDF

134.5 KB

MD5: d2b9814ca9f5ec3fa6c78ed47cc0bd6d SHA-1: 87a8f0913b8ee61d6c8df385919a720b4e038a9c SHA-256: 0c11f6ffceb04e6feb367d080a4e26a50985cdf1953e16407ce40e6a55a4169c

192 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains multiple embedded JavaScript streams, several of which were flagged as suspicious and obfuscated. High-severity heuristics like PDF_EVAL and PDF_UNESCAPE indicate the use of JavaScript eval and unescape functions, common in obfuscation techniques. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves leveraging these obfuscated scripts to likely download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0116_000.js` `5ddd81ff837ed47cdeae600499fcb33080a7c1ac480021d0016b252985e30c81`	pdf-javascript-stream	PDF /JS object 116 at offset 0x4BB	43981 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 224 eval/decoder/string-building token(s).
`javascript_obj0116_002.js` `70c31255e325c7293ca365a7905a0b77dfd1fa8dbbc95cfcc5106d896c408034`	pdf-javascript-stream	PDF /JS object 116 at offset 0x53A	43989 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 224 eval/decoder/string-building token(s).
`javascript_obj0123_003.js` `5219dfa58882a55398403ab90be64f7563631794c8cad33d70ad247053c14d65`	pdf-javascript-stream	PDF /JS object 123 at offset 0x386	136847 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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