PDF malware analysis — malicious · 43c78bb9093cee67

MALICIOUS

PDF

29.4 KB

MD5: 28ec4f356339776b7e5c5a144cc25d19 SHA-1: 991b3594ef85eaf0736db04a857cf0a128a8366e SHA-256: 43c78bb9093cee67b356197b53a540d1f48cb3c6e5607e2f04ca9ce404d7a94a

234 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and a Flash object. The ML classifier and ClamAV detection strongly suggest exploitation. The presence of 'javascript_obj0006_000.js' and the ClamAV signature 'Pdf.Exploit.Agent-35955' are key indicators of a potential exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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 0x98E	53922 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: unlikely
`javascript_obj0006_000.js` `ecd191f7a14f3c2f289c4dab26498713b686c18727b782f55b552f673413d742`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF6	9292 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 199 eval/decoder/string-building token(s).

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