Malicious PDF — malware analysis report

Static analysis result for SHA-256 916a9c3ef425c564…

MALICIOUS

PDF

42.3 KB Created: 2012-07-25 19:01:09 +04:00 Authoring application: Adobe Designer 7.0
MD5: 81acd2559ba65a49c023c153294e9226 SHA-1: 54e99735e8ea4927abf8ae1a3c6170aae6544249 SHA-256: 916a9c3ef425c564783e62bce0f8821612874957a205d41a6c13d81994c23dc7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file contains multiple high-severity heuristic firings indicating the presence of executable scripts and embedded files. Specifically, PDF_XFA_SCRIPT and PDF_EVAL suggest that the document is designed to run code. One embedded file, embedded_file_obj0045.bin, is particularly large and flagged as a suspicious artifact, likely containing the malicious payload. The XFA form structure and embedded scripts are commonly used to deliver exploits or download further malicious content.

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_obj0043.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x7481 85 bytes
embedded_file_obj0044.bin
5c2d5614d44acbbe2e457784cbd3e50d08745cc48bdef65e7f97353fd1ef37ad		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x7533 1523 bytes
embedded_file_obj0045.bin
7ae2dccd66818fb24eed531b002f2143e6bb4e7c3f1af27f366f828f4adab065		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x7805 30605 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
embedded_file_obj0046.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 46 at offset 0x8875 144 bytes
embedded_file_obj0047.bin
57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f		 pdf-embedded-file PDF EmbeddedFile object 47 at offset 0x8937 212 bytes
embedded_file_obj0048.bin
601cac0164ee96437718122dca87801fdbc889ed5d0e5557761e61baa2ba3a65		 pdf-embedded-file PDF EmbeddedFile object 48 at offset 0x8A2E 2377 bytes
font_00_cff_off00001498.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x1498 31178 bytes
font_01_cff_off00008dd2.bin
86624d0965b7260293269128a62aaa383810ffcd3ae9232befee3909d2d2476b		 pdf-font-stream PDF embedded font (cff) at offset 0x8DD2 1989 bytes

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