PDF malware analysis — malicious · fe490cff80c3749c

MALICIOUS

PDF

111.2 KB

MD5: 22f59d1bf7cead45f13cfbbcd8b34c45 SHA-1: 472ce9821171661e5b7597e6cfd9277a6358f633 SHA-256: fe490cff80c3749cad59095ef748135e9c43f425bf3efb46a3ee05cf628c4db9

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF file contains embedded JavaScript and a RichMedia (Flash) object, indicating an attempt to exploit vulnerabilities within the PDF reader. The ML classifier strongly suggests malicious intent. The embedded JavaScript, named 'javascript_obj0006_000.js', likely contains obfuscated code designed to download and execute a secondary payload, possibly leveraging the embedded SWF file. The use of ASCIIHexDecode with exploit indicators further supports this conclusion.

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 0x729	55839 bytes
`javascript_obj0006_000.js` `1a91fe808d871ce39c4b25be2b8c68a65e40a1d73a88e01b2a2bd6592ac6deff`	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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