Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aab1dfee3e32c26…

MALICIOUS

PDF

49.0 KB Created: 2012-11-02 18:06:10 +03:00 Authoring application: Adobe Designer 7.0
MD5: 02d41f15f4b092b9eebb860b8f08a073 SHA-1: d64cb4678d18f602a3d9b647693429744ebc6239 SHA-256: 9aab1dfee3e32c26d1567b5105e9a593fc416700bf38d12a633df0bb36170bf2
156 Risk Score

Malware Insights

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

The PDF sample contains multiple high-severity heuristic firings indicating embedded executable scripts and XFA form exploitation. The ML classifier strongly flags this PDF as malicious. While no specific script content is directly readable due to obfuscation or truncation, the presence of embedded files and scripts, along with the XFA form, suggests a multi-stage attack designed to download and execute a secondary payload. The extracted artifacts 'embedded_file_obj0048.bin' and 'font_01_cff_off00008c4a.bin' are flagged as suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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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