PDF malware analysis — malicious · ae38acc999b20bab

MALICIOUS

PDF

111.2 KB

MD5: a68ddf383539c58b398deb74cae4ec8d SHA-1: c695a0fae06af3250fecd1f04e2e416b4d0dab58 SHA-256: ae38acc999b20babac4e95128a5ef95c7423c76424f7cf431e5210feb2b34f9d

124 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF contains embedded JavaScript and RichMedia (Flash) content, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA. The ML classifier strongly flags this PDF as malicious. The embedded file '20102884.swf' is likely part of the exploit chain. While the exact exploit mechanism is not fully detailed, the presence of these components suggests an attempt to leverage vulnerabilities within the PDF reader or associated plugins.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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
`20102884.swf` `ce5f7936cf8e3536a88a804ce2d6902022df1794fa878bdc64a26866e34ba989`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x72C	55839 bytes
`javascript_obj0006_000.js` `4986f235d86faa58060ad3d7304bb178b7cc84690f9a9a4f66d34b086faa2bb0`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF6	1434 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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