Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c2c6834d1f21bd…

MALICIOUS

PDF

108.6 KB Created: 2010-03-31 12:55:11 -04:00 Authoring application: Adobe InDesign CS4 (6.0.4) (via Adobe PDF Library 9.0)
MD5: 94311a11fb535b2cfd28f4caf9fbb032 SHA-1: 8adb9f7ecde6437d96a806407895e7738aa76f34 SHA-256: 26c2c6834d1f21bd8b16d881689b06d93aa7200e4620cc4fe4d3699d32cda737
282 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and exploits CVE-2014-0496, indicated by the 'app.addToolButton/removeToolButton' heuristic. The embedded JavaScript is likely designed to download and execute a second-stage payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'PDF_EMBEDDED_CHILD_STATIC_TRIAGE' findings. The ClamAV detection 'Pdf.Dropper.Agent-7241067-0' further confirms its malicious nature as a dropper.

Heuristics 12

  • 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)
  • Embedded PDF child has suspicious static findings critical PDF_EMBEDDED_CHILD_STATIC_TRIAGE
    PDF contains an embedded PDF stream whose extracted child matches suspicious or malicious PDF heuristics. Wrapper PDFs are commonly used to hide the actual exploit or lure payload from scanners that do not recursively inspect attachments.
  • ClamAV: Pdf.Dropper.Agent-7241067-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7241067-0
  • 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
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/g/img/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/xap/1.0/sType/ManifestItem#
    • http://ns.adobe.com/xmp/InDesign/private
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/t/pg/
    • http://ns.adobe.com/xap/1.0/sType/Dimensions#
    • http://ns.adobe.com/xap/1.0/g/

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0003_000.js
b323e7ca5d8dde51dec7d79011e978cf0ce8ca78a2c5727274eac5c1ff94717a		 pdf-javascript-stream PDF /JS object 3 at offset 0x9A 4360 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 13 eval/decoder/string-building token(s).
stream_001_off000014e9.js
d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14E9 1042 bytes
font_00_type1_off00001985.bin
c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b		 pdf-font-stream PDF embedded font (type1) at offset 0x1985 97 bytes
font_01_type1_off00001c0c.bin
b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d		 pdf-font-stream PDF embedded font (type1) at offset 0x1C0C 144 bytes
stream_019_off0001a03a.js
e65734caf83401d11ebc0c5c901e9aead34f75f53eb9788fe409a09346be50cc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A03A 7663 bytes
objstm_0121_00.bin
65385369b004323d20553383cadc558ce381c82bb8ad5d2dfc486260d221ee1e		 pdf-objstm-decoded PDF /ObjStm 121 0 obj (inflated) 1220 bytes
font_00_cff_off0000b46d.bin
38d7d0627d6ef08fdb595be75f8f12752f3381fa7a1441ca8f76a5e76dc6e7b9		 pdf-font-stream PDF embedded font (cff) at offset 0xB46D 609 bytes
font_01_cff_off0000ba3f.bin
5f3f348279f5218a0f3607c4a8e7c1b2190742072e04b58112191aa6b4235f52		 pdf-font-stream PDF embedded font (cff) at offset 0xBA3F 886 bytes
font_02_cff_off0000c1e7.bin
7e5cb310f6cb7822b8a316192e8347738bb3f1d76fe954bdbf17623d2e87f2fb		 pdf-font-stream PDF embedded font (cff) at offset 0xC1E7 3808 bytes
font_03_cff_off0000d457.bin
99bc093cddfa13f76f619bedeaf723ce24882a341f9686e35da3cad8dbab0a72		 pdf-font-stream PDF embedded font (cff) at offset 0xD457 3669 bytes

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