PDF malware analysis — malicious · b8338451664f74a8

MALICIOUS

PDF

2.2 KB

MD5: c037fae652bbe14e6679db2a6906a322 SHA-1: 59c32d589440135f40fce3c406d77d348c3da572 SHA-256: b8338451664f74a8a8e25f1f0aa6a1a1715572265cc25c0274374cf1c8c22e6b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1059.007 JavaScript/JScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream is obfuscated using `unescape()` and `String.fromCharCode()`, suggesting an attempt to hide malicious code. ClamAV detection as 'Pdf.Exploit.Agent-36098' further confirms its malicious nature. The primary function of the script appears to be the execution of obfuscated code, likely to download and execute a second-stage payload.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36098 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36098
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `e1ab3bbf30605cecdce6db9d2556198626dbb178f7a4cb471a9436bb6e8bd92f`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x795	462 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `5292a99c60488dd23cb854bb0298057d768c2d56ce17f209e5ecfe6c5e334c12`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2822 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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