PDF malware analysis — malicious · 5ebc4961f159bf3c

MALICIOUS

PDF

46.5 KB Created: 2007-14-37 57:98:00 Authoring application: Above Able (via According About)

MD5: d64db7e98d30225ae5cbf230432bd55f SHA-1: 229d875fe10d5410cf1d6dcc58d801b7abfd693d SHA-256: 5ebc4961f159bf3c89119918874229dcfa4bfa924c5e5e270a1195a24f749b9a

126 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is heavily obfuscated, but heuristic analysis indicates it is part of an exploit cluster targeting PDF vulnerabilities. The script likely downloads and executes a second-stage payload from a remote source. The presence of XFA forms and the use of String.fromCharCode further support the exploitation of PDF-specific features.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 7

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.
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.
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://www.bitstream.com
- 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_obj0012_000.js` `815e8ec6f5c03ac6aa4fdfc850a4ac6945c7a4b5c21b9477d818c7f758f8cc8f`	pdf-javascript-stream	PDF /JS object 12 at offset 0xA09A	22693 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`font_00_sfnt_off00000317.bin` `f475159f63e4f99eba18ac3c6047c58385b8171b04f2e2cc3390b6fca5f94250`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x317	65932 bytes

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