PDF malware analysis — malicious · 847d4ad10a55255b

MALICIOUS

PDF

37.7 KB

MD5: a888748a3ee306a82bde4da902ada534 SHA-1: d27c3a657948eb0239f6821ebcdf4bacab12741c SHA-256: 847d4ad10a55255b45bb692da25a8972854c1fabd2f519076fddec52ca1bf8b0

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and Flash content, along with heuristic firings related to JavaScript actions and exploit indicators. The presence of an embedded JavaScript file suggests an attempt to execute code. The ML classifier strongly flags this PDF as malicious. The primary attack vector appears to be leveraging embedded objects within the PDF to execute malicious code, likely for further payload delivery or exploitation.

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` `450126f4675bbb70f2c02f8bcf0187787d922b8c07cddbfb9e8bf41a1ee9ac90`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1552 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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