PDF malware analysis — malicious · 2d837a2b25031a24

MALICIOUS

PDF

54.2 KB

MD5: b144279e5ba31a25cafdc5e3800e2b71 SHA-1: 2606df38631b8ef66d76c5b458cc5e84a0d54cf8 SHA-256: 2d837a2b25031a241b2cc488367d4bebeccb6af7cdc8761ba8e78dca20381003

124 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript and Flash content. The ML classifier strongly flagged it as malicious. The presence of a JavaScript stream and an embedded SWF file suggests an attempt to execute arbitrary code or exploit vulnerabilities within the PDF reader or associated plugins. The extracted JavaScript file and SWF file are the primary indicators of compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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` `8c702f60d07ed3fe21053014a9ab550df3fd5b001b6f071ffedd8bb7b9881feb`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xAB7	52522 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.89, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `cdf0ae8f061669701d36342f1d9a476bb03e9d18819882400bfe25b05a105237`	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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