PDF malware analysis — malicious · b72aa0ba4539bba1

MALICIOUS

PDF

35.3 KB

MD5: b97866ee1337e0342a5ff13d7b22f850 SHA-1: 16385b002621fa5ffc1a8ec23abe89f20c8002d8 SHA-256: b72aa0ba4539bba1e294a82557efcb27b1daaa22e233bd7f8d6f961ba90c8f47

132 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript, a Flash object (Adobe.swf), and the use of string manipulation techniques like ASCIIHexDecode and String.fromCharCode. The ML classifier strongly flags this PDF as malicious. The presence of these embedded components suggests an attempt to execute arbitrary code or exploit vulnerabilities within the user's PDF reader. The embedded JavaScript and Flash object are likely responsible for the malicious payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`Adobe.swf` `8f9c84c8c00bc62ae296a81fac6640aa852ea67548abc1bd639aa0da1a1696c4`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xE7B	27347 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `6b3fed2864f327ea7fb0240abb5b0b273e3d28bcb140ab4385f266979d47d8b6`	pdf-javascript-stream	PDF /JS object 6 at offset 0x105	10566 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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