Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c38f525c6b4d2b…

MALICIOUS

PDF

516.9 KB Created: 2010-02-23 12:29:53 -08:00 Authoring application: Adobe LiveCycle Designer ES 8.2
MD5: 0896afe10bdf210ffe4b737cffbd7fc2 SHA-1: 2eacdeebe99742d7004770f3c4aa5b833b2058b7 SHA-256: a4c38f525c6b4d2b1962161adb11aa441d064e72efa2e264969601fed0c6332f
122 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic specifically flags a decompressed stream script. This script is likely responsible for downloading and executing a second-stage payload, as suggested by the presence of an embedded file artifact named 'embedded_file_obj0004.bin'. The ClamAV detection 'Pdf.Exploit.Agent-20649' further confirms the malicious nature of this PDF.

Heuristics 9

  • ClamAV: Pdf.Exploit.Agent-20649 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-20649
  • 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.
  • 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
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/
    • http://www.w3.org/1999/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 11

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0002.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 2 at offset 0x56 85 bytes
embedded_file_obj0003.bin
0cae1494b9c99505bf126e683a1a8be36bc8d5e793ab829e266d6e2fd62ccac3		 pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x108 1466 bytes
embedded_file_obj0004.bin
833d947e75fb66ffae012a6c8bb8d40fed2749e2142df9eebe25188b09b85181		 pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x3C7 6968 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
embedded_file_obj0006.bin
226eeacc5eecef2a05ca480f144ff6936594e20b5c7672e8f29f25c8bea65a56		 pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x1133 2928 bytes
embedded_file_obj0007.bin
4cb349134bdb5f1a1c03281df9b53128ebe947f235398a912a4f0a9f638b24d5		 pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x14A0 200 bytes
embedded_file_obj0008.bin
d51b9fc28b592405fb598e711d1495e1421571073bc2e8542d55389768716c06		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x1593 835 bytes
embedded_file_obj0009.bin
e65f1e07bc965092b3153e64a1e8777a909cc47a98c0e2a10d38c47def2e6652		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x176C 291 bytes
javascript_obj0047_000.js
f574e4d51594d1a8fd22e125b109b827c437aa898edc78babb62dbb93f8744f8		 pdf-javascript-stream PDF /JS object 47 at offset 0x12A04 1532 bytes
javascript_obj0048_001.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 pdf-javascript-stream PDF /JS object 48 at offset 0x12BEF 870 bytes
javascript_obj0049_002.js
826c5622c798d67e5281cca7e05933dddc90ccdcb0a6177c9f7d06f11bef8f7f		 pdf-javascript-stream PDF /JS object 49 at offset 0x12D49 2795 bytes
stream_003_off00000f6b.bin
f47c3dc8c4eeb64abc2cc332be719add15af6ce6dfdcdb477c08a1aefdbe7477		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF6B 11740 bytes

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