PDF malware analysis — malicious · 231128dbdc3c7634

MALICIOUS

PDF

37.7 KB

MD5: 2ba995cf4f6de2dd892cf678059823b0 SHA-1: d3dd09aa7274b83a29c9230402a32a5e4ab4b7e4 SHA-256: 231128dbdc3c7634af5f3bf0215efb7bf4f175df00b96da9dbac4ec69348eefa

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and Flash content. The ML classifier strongly suggests maliciousness. The presence of a JavaScript stream, identified as 'javascript_obj0006_000.js', indicates that the document is designed to execute code, likely for downloading and executing a second-stage payload. The combination of PDF, JavaScript, and Flash points towards a multi-stage attack vector.

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 0xAB9	55839 bytes
`javascript_obj0006_000.js` `308df6aab9385200d4557b6570d53519b5a8140014b8618dab4835875a81b81f`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1558 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.