PDF malware analysis — malicious · fbb04f1fc693e710

MALICIOUS

PDF

1.6 KB

MD5: 8040d1b2cda7f5240c8137f8da1eb539 SHA-1: 0b570b04d0175c8ac6cc2125c574feb853b36abd SHA-256: fbb04f1fc693e710355a3b1a85088a2a3e7aea98e71a0c81a9b20c85340c64cf

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including `PDF_JAVASCRIPT`, `PDF_JS`, and `PDF_EVAL`. The `eval()` call and `String.fromCharCode` usage within the embedded JavaScript stream suggest dynamic code execution. The `CLAMAV_DETECTION` heuristic further confirms its malicious nature. The primary function of the script appears to be downloading and executing a secondary payload, as evidenced by the extracted artifact `javascript_obj0009_000.js`.

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` `50403b42e577c25dd8632d055bfeb2277d33ed4ad91341f0c1b30fd4e1831ca9`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3898 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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