PDF malware analysis — malicious · 3efed25c8d9d42e6

MALICIOUS

PDF

970 B

MD5: 040937a9ec97194dd3167f6849522f5a SHA-1: 1f27c5c522d2b9f61f74a274bda75cdb4b48a0e7 SHA-256: 3efed25c8d9d42e6dac3a096bd2d57decb8f7fef70ad00f0238ea49e5dc788f2

66 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristics 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 malicious code or downloading additional payloads.

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` `6b006b8585a421bfebbfd0386bd0d9f0343207299b894b59dd6d28b312ced757`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	636 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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