PDF malware analysis — malicious · 49ade296a045d31c

MALICIOUS

PDF

31.4 KB

MD5: 231a6a1f1a31708217ce008eb1f6bb36 SHA-1: 61a4aa14f9d23e79093bdaf4c384e648f56424d0 SHA-256: 49ade296a045d31c29ca66050853a0bb3c27ebd0a0fac10cdc2988c26f285f32

142 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 and Flash content, as well as heuristic firings related to PDF exploits and ML classification. The presence of embedded JavaScript and Flash suggests an attempt to execute arbitrary code or exploit vulnerabilities within the PDF viewer. The ML classifier's high confidence score further supports the malicious nature of this file. The embedded artifact 'javascript_obj0006_000.js' is a key indicator of the malicious functionality.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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
`bl.swf` `4d4d42d908c48737d0cbe1f33c14f197803950e6ff47f9c0f13e1d51a231494d`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xF51	53991 bytes
`javascript_obj0006_000.js` `8c97244de2cf08ad9451ad1eb466fe2d609d2e7eddc08673a61505377401d518`	pdf-javascript-stream	PDF /JS object 6 at offset 0x106	10931 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 239 eval/decoder/string-building token(s).

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