PDF malware analysis — malicious · b0229a284653fda3

MALICIOUS

PDF

1.6 KB

MD5: 89e53d9d7b2f8b9b8c0c1eb6262f0b70 SHA-1: fcd111407a5ecce4e1a6654257726976a1c9b6c4 SHA-256: b0229a284653fda398ef588a0b61a0dd9f7cd520f7015d05cdf3a2cc888f842c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream is obfuscated, as suggested by the PDF_UNESCAPE and PDF_FROMCHARCODE firings, and is extracted as 'javascript_obj0005_000.js'. This JavaScript is likely responsible for executing a malicious payload, potentially leading to further compromise.

Heuristics 5

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.
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_obj0005_000.js` `0573ba9f49fa7f28e8d3be877ea9f22351f30b98f74bf19297fa61d44b8ac052`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	4943 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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