Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8f60c37841025d…

MALICIOUS

PDF

49.0 KB Created: 2012-11-02 18:06:10 +03:00 Authoring application: Adobe Designer 7.0
MD5: 66233bbed01f73eb93506dda5144e3f0 SHA-1: 9b2715cbf5195fc615f45bfd19bb69b2dfa59d8e SHA-256: 9a8f60c37841025d3e4b644d04b60d465bdeb3bbc2fbc55aea744f4f637a2323
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded objects and XFA forms with risky executable scripts, indicating an attempt to exploit vulnerabilities. The presence of `eval()` calls and embedded script payloads strongly suggests the execution of malicious code. The high entropy and obfuscation indicators in the extracted artifacts, specifically `embedded_file_obj0048.bin` and `font_01_cff_off00008c4a.bin`, further support this assessment. The exact payload and its behavior could not be fully determined due to obfuscation.

Heuristics 8

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (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.
  • 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://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0046.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 46 at offset 0x756D 85 bytes
embedded_file_obj0047.bin
f20aceb8dbc16d07642c756ca1ccc141a87f1f44f1a99949a4c6a6a8678b4c98		 pdf-embedded-file PDF EmbeddedFile object 47 at offset 0x761F 1526 bytes
embedded_file_obj0048.bin
e2fb7e9ea37d12fafd513b9473e7ddef53917a6d32e59905abb6b630dd3b12e1		 pdf-embedded-file PDF EmbeddedFile object 48 at offset 0x78EF 6265 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0049.bin
0b7fe2cbe79087012463f41fc1327af7a43b4981b1049b2448bcaa170e431454		 pdf-embedded-file PDF EmbeddedFile object 49 at offset 0x853F 171 bytes
embedded_file_obj0050.bin
37cd6404a3d8d63a939da3420fad817b7ea2a487799f95ad2ced8d56fa5b8ca7		 pdf-embedded-file PDF EmbeddedFile object 50 at offset 0x8608 6534 bytes
embedded_file_obj0051.bin
57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f		 pdf-embedded-file PDF EmbeddedFile object 51 at offset 0x8AE5 212 bytes
font_00_cff_off000012d0.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x12D0 31178 bytes
font_01_cff_off00008c4a.bin
b59db72ce2f5ef10b3530ca6cac89f73c4061ad9bb7474f16e1d7c01a5a2a09f		 pdf-font-stream PDF embedded font (cff) at offset 0x8C4A 4211 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.42, consistent with packed or encrypted content.

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