PDF malware analysis — malicious · 279a2290b2797f12

MALICIOUS

PDF

6.3 KB Authoring application: Jganbo

MD5: d548b76c39e2419c6f0013ec20bd8184 SHA-1: 9f927e9b310724766c00e4d09d936c7293a41c1e SHA-256: 279a2290b2797f12ad7723ef331792d48aad279abeb972395d20549a544adc1a

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream was obfuscated using unescape() and String.fromCharCode(), suggesting malicious intent. The extracted artifact 'javascript_obj0018_000.js' is likely responsible for downloading and executing a second-stage payload. The document body text is largely nonsensical and appears to be filler content.

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_obj0018_000.js` `c2a54dde13df085137a9e0e810ceb62443e08bdbfc6af303934c48e334af81c5`	pdf-javascript-stream	PDF /JS object 18 at offset 0x151C	341 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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