PDF malware analysis — malicious · bd8ffa71c5c5abca

MALICIOUS

PDF

37.7 KB

MD5: 104a583b0bd57ccce750c2cb0be0f64e SHA-1: 936b9e8bbb583a030e896c7bb7f12af2ed1edf2a SHA-256: bd8ffa71c5c5abcabb991a4ad9bd57700b0e20544cb8d1c3c3d7f344a577d1d5

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript, a Flash object, and the use of ASCIIHexDecode filters. The ML classifier strongly flags this PDF as malicious. The presence of an embedded JavaScript file suggests an attempt to execute code, likely for downloading and executing a second-stage payload. The extracted artifacts, 'javascript_obj0006_000.js' and 'Adobe.swf', are key indicators of this malicious activity.

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
`Adobe.swf` `ce5f7936cf8e3536a88a804ce2d6902022df1794fa878bdc64a26866e34ba989`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xAB5	55839 bytes
`javascript_obj0006_000.js` `c9ae3be45ee2cf05a032cf5e268568ad2925bb2133a0943f33ee21a60b7903dc`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1564 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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