PDF malware analysis — malicious · bd1ccfd2df37a040

MALICIOUS

PDF

15.3 KB

MD5: 091ad0933d2aa1ff10cf1cf4ad75f338 SHA-1: 2e1968872374ae4e793b471230056b06666b0be5 SHA-256: bd1ccfd2df37a0409528fa1996bc0e6e059a8538b85812d557cb27cf6ac858d8

192 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file exhibits high-confidence malicious indicators, including ML classification and ClamAV detection for obfuscated content. Embedded JavaScript streams, identified as 'javascript_obj0116_000.js' and 'javascript_obj0123_002.js', contain obfuscated code with eval() and unescape() calls, strongly suggesting they are designed to download and execute a second-stage payload. The specific URLs or execution commands are not directly reconstructible due to the obfuscation.

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` `ed4758336e3cfad5ca7e1c026846dc2c595c3ab955b3a9bd1595b6320356fbc1`	pdf-javascript-stream	PDF /JS object 116 at offset 0x4BB	43727 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 230 eval/decoder/string-building token(s).
`javascript_obj0123_002.js` `55b1521fa99b0accdf81a1915dfb9ec47afdbbb345a2b2e033976ad6863e5b26`	pdf-javascript-stream	PDF /JS object 123 at offset 0x386	14747 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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