PDF malware analysis — malicious · 01f480371f5437fd

MALICIOUS

PDF

3.7 KB

MD5: 380559d4e8a521a9ca6770494e94eaa3 SHA-1: 03d6aaca623db81839bbef4085f6255e8b428a52 SHA-256: 01f480371f5437fdcbe1ab03faaa5b9068fb94be8e5c51e58426884dae71308d

214 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains JavaScript that is heavily obfuscated but appears to be designed to exploit a vulnerability and download a second-stage payload. The presence of PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE heuristics, along with the ML classifier, strongly indicates malicious intent. The script's obfuscation and use of eval() suggest an attempt to conceal its true functionality, likely to download and execute further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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
`javascript_obj0006_000.js` `db573c1164f2ef5fb00f65b85721f7bff9193f3aab6b6ef3dbf08cf6e7958921`	pdf-javascript-stream	PDF /JS object 6 at offset 0x226	8852 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_000_off0000012f.bin` `2f8c75f2e9f3e540017d7333425c297887fb0cf44b2c4fbe17b9186842df87a2`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x12F	379 bytes

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