PDF malware analysis — malicious · 58fcd9c19ea62ece

MALICIOUS

PDF

37.7 KB

MD5: bfe4efa2262efa521abfbce2d85d5607 SHA-1: 4f739ed2ea75c283af4adfa90832d836ffd48c6b SHA-256: 58fcd9c19ea62ece0bd81fb7ff21d4956fb16a39a2780f7ef35231ca60e22376

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and a Flash (SWF) file, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA. The ML classifier strongly flagged this PDF as malicious. An embedded JavaScript file, 'javascript_obj0006_000.js', was extracted, suggesting it likely contains code to execute malicious actions, such as downloading a second-stage payload or exploiting a vulnerability within the PDF reader. The presence of ASCIIHexDecode filter with exploit indicators further supports this. The exact intent of the script is not fully discernible due to potential obfuscation, but its presence alongside the embedded SWF points to a multi-stage attack.

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 0xABB	55839 bytes
`javascript_obj0006_000.js` `9d61c68ac51c8fb748bfca1e3e699856f0a80db42ad56637bbde92a14e20ae5c`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1546 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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