PDF malware analysis — malicious · 5a141af67a7b9b09

MALICIOUS

PDF

37.7 KB

MD5: 177d67a735fdcc840c4d46cd97403d7e SHA-1: 9bc544e41e296cf60ba49c063564073d357e9239 SHA-256: 5a141af67a7b9b09a43e0e5d5e9bb0d456704f9b12155e12f308360b41da9fc1

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript and Flash content, and a high ML classifier score. The presence of a JavaScript stream and embedded SWF file suggests an attempt to execute arbitrary code or exploit vulnerabilities. The ML classifier's strong positive prediction further supports its malicious nature. The primary attack vector appears to be the exploitation of embedded content within the PDF.

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 1 related finding 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 0xAD1	55839 bytes
`javascript_obj0006_000.js` `80cfc1e9f47f7387c46d905c23a8b77fc1c047f1706a78596a6b02ee3ccad7d9`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1576 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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