Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4992a6c1f0bd10…

MALICIOUS

PDF

43.1 KB
MD5: ebc04c3ddd5cea5b7f528d8b7821cfa2 SHA-1: 404e4ce2cb731e7c319af2d3bae18cc6cc8f765e SHA-256: db4992a6c1f0bd102ecbc174903f1a268d03b85b30cb66b0485c68968401b838
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream is obfuscated using String.fromCharCode and ASCIIHexDecode filters, indicating an attempt to hide malicious code. The presence of an extracted JavaScript file further supports this. The likely intent is to download and execute a second-stage payload from a remote source, which is a common technique for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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
  • Suspicious extracted artifact medium 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.
  • 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)
  • 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.

FilenameKindSourceSize
javascript_obj0012_000.js
4d862ddb65815c82a7162406454e2859b62c7abd8b0d3ace3960aa4ca7d356e3		 pdf-javascript-stream PDF /JS object 12 at offset 0xA0B2 3870 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s). Carved artifact contains 4 long hex-escaped blob(s).
font_00_sfnt_off0000033c.bin
26f3e7c91c76e658576c1bbb605ddb8e33e657870ea2f8ad3b8fe8f80b303358		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33C 65932 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.