Malicious PDF — malware analysis report

Static analysis result for SHA-256 169112c81c20de29…

MALICIOUS

PDF

7.9 KB
MD5: ee5bd0afea04868c1b730607cdf48a87 SHA-1: 90685415c24e5b87498e7e0f9df9d965f0fa1626 SHA-256: 169112c81c20de29864f3b351571a1b06774604cab1799ed451ea424817d5a7a
306 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document leverages JavaScript to exploit CVE-2014-0496, a vulnerability in Adobe Reader related to app.addToolButton/removeToolButton. The embedded JavaScript contains shellcode and heap spray techniques, indicating an attempt to download and execute a secondary payload. The ML classifier and ClamAV detection strongly support its malicious nature as a dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 11

  • app.addToolButton/removeToolButton — CVE-2014-0496 critical CVE exact CVE_2014_0496
    PDF JavaScript combines app.addToolButton() and app.removeToolButton() with heap-spray shellcode markers — the public Adobe Reader/Acrobat ToolButton use-after-free exploit shape for CVE-2014-0496. (matched in decompressed stream)
  • 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.
  • ClamAV: Pdf.Dropper.Agent-7232947-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7232947-0
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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/3.0/
    • http://www.xfa.org/schema/xfa-template/3.0/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0005_000.js
e70fd357660219635ed5a42dd73242f685f1a3b5385b61a2c45a145edcde4e53		 pdf-javascript-stream PDF /JS object 5 at offset 0x276 4527 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 13 eval/decoder/string-building token(s).
stream_001_off0000166a.js
d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x166A 1042 bytes
font_00_type1_off00001b08.bin
c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b		 pdf-font-stream PDF embedded font (type1) at offset 0x1B08 97 bytes
font_01_type1_off00001d8f.bin
b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d		 pdf-font-stream PDF embedded font (type1) at offset 0x1D8F 144 bytes

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