PDF malware analysis — malicious · d64d5da5c2cd17e1

MALICIOUS

PDF

13.0 KB

MD5: 2ac962c729fe0166686fa3e2b615d375 SHA-1: b22bc77e42325d66e04560f4f5a34a1186d94721 SHA-256: d64d5da5c2cd17e19541e41ee90a4239cc3c8ab086054e6c993c68017e51bc2d

194 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file exhibits high-confidence malicious indicators, including ML classification and ClamAV detection for obfuscated content. Embedded JavaScript streams, identified by `PDF_JAVASCRIPT` and `PDF_JS` heuristics, are present. The `PDF_EVAL` and `PDF_UNESCAPE` firings suggest the JavaScript is heavily obfuscated and likely performs dynamic code execution. While the exact payload is not discernible due to obfuscation, the presence of these techniques strongly indicates the script's purpose is to download and execute a secondary malicious payload. No specific family could be identified.

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` `9ff6769d6b840b0e796eac04ad8ef1d2a83b207058f4a10e84020285939552ff`	pdf-javascript-stream	PDF /JS object 116 at offset 0x4BB	44301 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 226 eval/decoder/string-building token(s).
`javascript_obj0123_002.js` `2fdb39410f8de2635ec3e03239d2e0a7af87ccf88217f4b557219bf7d218c41b`	pdf-javascript-stream	PDF /JS object 123 at offset 0x386	12457 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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