PDF malware analysis — malicious · 790f480aaaa1b2dc

MALICIOUS

PDF

15.3 KB

MD5: 28b6ae1a9f3e3b8c257933181acbe188 SHA-1: 34d8ade6fdf6ae6732d5fae008a6db2dadde703b SHA-256: 790f480aaaa1b2dcbf58badfa43a1295df94a39870abb8465aa471e25ba091dc

194 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript streams that are heavily obfuscated, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. The ML classifier and ClamAV also flagged this file as malicious. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as suggested by the obfuscation and the nature of the detected heuristics. The extracted JavaScript filenames are included as IOCs.

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` `946d941596f7f057b24ffb2ced11e24333674a380e1182f479c26cea37055aa1`	pdf-javascript-stream	PDF /JS object 116 at offset 0x4BB	43921 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 218 eval/decoder/string-building token(s).
`javascript_obj0123_002.js` `c677ec6496d165f0bf7495de89ab7214375f2b69ca03b6b8abad089071df2820`	pdf-javascript-stream	PDF /JS object 123 at offset 0x386	14801 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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