PDF malware analysis — malicious · deb36ef3bb102d56

MALICIOUS

PDF

29.1 KB

MD5: d22b2fa15965e705a49918b1e5230e9a SHA-1: 137ecc72e304fa846aaefd8a3fdd54e47da56b39 SHA-256: deb36ef3bb102d56b09ece54ba83dc8f1cd6d7d96212871d640c1fe52efbac7d

224 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1559.002 Component Object Model

The PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection (Pdf.Exploit.Agent-35955). It contains embedded JavaScript and a RichMedia (Flash) object, suggesting an attempt to exploit vulnerabilities or execute arbitrary code. The extracted JavaScript file, 'javascript_obj0006_000.js', and the embedded SWF file are the primary indicators of compromise.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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
`20101297.swf` `155cb1ff00e6c687a380ad31d1ca035be4d34d8d46179a65e733a7fef7b99805`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x841	53922 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: unlikely
`javascript_obj0006_000.js` `9223d59a8a2001d71c7f1966aefd34a13ffc629762af367d9ccacd83d180a568`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF6	9238 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 199 eval/decoder/string-building token(s).

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