PDF malware analysis — malicious · 9aa939210054da42

MALICIOUS

PDF

3.9 KB

MD5: 0140e0d2e75fda8b374be3e8043c5d06 SHA-1: 6fb00f37061fbb734f91c27b579544838e7f6794 SHA-256: 9aa939210054da4251c5cc959fd35bcb048b5e07a797abb5908946d8aa3f240b

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains obfuscated JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics, and the presence of an embedded JavaScript file. The JavaScript stream uses String.fromCharCode, suggesting an attempt to hide malicious code. The ClamAV heuristic further confirms the malicious nature due to obfuscation. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as suggested by the embedded artifact name and the general behavior of such obfuscated scripts.

Heuristics 5

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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. (matched inside decoded stream)
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0039_000.js` `158703708ee1ed63066cf8fe8228ca7e3ca2c1ddf48878cda41531083ec6df27`	pdf-javascript-stream	PDF /JS object 39 at offset 0xA	15674 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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