PDF malware analysis — malicious · 503b8c5d61af6894

MALICIOUS

PDF

111.2 KB

MD5: 22c554c1818d8997d6ebc410cc9947e6 SHA-1: ad7086d3e7f577c51490930c00028e0707fe9c53 SHA-256: 503b8c5d61af6894749324521ecd48971d227dec79726e01f48573bfcf14b086

126 Risk Score

Malware Insights

MITRE ATT&CK

T1559.002 Component Object Model Hijacking: DLL Side-Loading

The PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript and Flash content. The ML classifier strongly flags this PDF as malicious. The presence of 'javascript_obj0006_000.js' and '20102884.swf' as embedded artifacts suggests these components are central to the attack. The JavaScript stream, combined with the Flash object, likely facilitates the execution of further malicious code or exploits.

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 0x73C	55839 bytes
`javascript_obj0006_000.js` `a1e51c033cecbb3e657616d2e2ae5a3ba89d07149d1a5f37dba9ae5856c960d9`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF6	1470 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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