PDF malware analysis — malicious · bb28dc9a2e27a5ed

MALICIOUS

PDF

1.6 KB

MD5: 728818127e0e62f9033f87800e6be42e SHA-1: 6cd949f89a275a417e5de4691b70c292cba199e7 SHA-256: bb28dc9a2e27a5ed7d9a5512347d9820661310c50a10d38b458000802a5d4ff6

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1204.002 Malicious File: Malicious File T1071.001 Application Layer Protocol: Web Protocols

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including `PDF_JAVASCRIPT`, `PDF_JS`, `PDF_EVAL`, and `PDF_FROMCHARCODE`. The embedded JavaScript, named `javascript_obj0009_000.js`, is likely responsible for downloading and executing a secondary malicious payload. The ClamAV detection `Heuristics.PDF.ObfuscatedNameObject` further confirms the malicious nature of the file.

Heuristics 6

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 (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.
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_obj0009_000.js` `1159b40e67e2379cabf3be5a9f2e7e4ca46bb316df2019937332f88907638d5b`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3909 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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