PDF malware analysis — malicious · 1b27b0e28716eb09

MALICIOUS

PDF

20.6 KB

MD5: dba05781183f4aca037b6b9a6a54c408 SHA-1: 0094b50584eb05bcb404fa2b6949613695184791 SHA-256: 1b27b0e28716eb09a174f64ede49bd0996d151e19ec035026fef36cd157b34db

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript is heavily obfuscated, including the use of eval() and String.fromCharCode(), making it difficult to determine the exact payload. However, the presence of these obfuscation techniques and the ML_NYX_PDF_MALICIOUS score strongly suggest malicious intent, likely to download and execute a secondary payload. The ClamAV detection of 'Heuristics.PDF.ObfuscatedNameObject' further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

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
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. 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_obj0005_000.js` `5f8f2c9596873aa6e337e3b3da04a0bccf4fec8a39604de8e23396e0cb7102e3`	pdf-javascript-stream	PDF /JS object 5 at offset 0x17E	20399 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `4f6c7c54e5f752062b8d995aeeef8dfbd127cfdaaf3c81e3d2d4dbdeb3e6437a`	pdf-javascript-stream	PDF /JS object 5 at offset 0x17E	52 bytes

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