Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf46b927bdd419b…

MALICIOUS

PDF

49.1 KB Created: 2012-10-25 23:08:39 +04:00 Authoring application: Adobe Designer 7.0 First seen: 2013-08-29
MD5: a895f3037bf5bebee2431c9543cdddaa SHA-1: 4f161bfab042134fc749e9563113d1bc605e9330 SHA-256: abf46b927bdd419baf85c101a3b4e8da01125233a5dbe92fcb9f5baf3e491a4e
102 Risk Score

Malware Insights

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

The PDF file contains an XFA form with a risky executable script, indicated by high-confidence heuristics. This script is likely designed to download and execute a second-stage payload. The ML classifier also flagged this PDF as malicious with a high score. No specific family could be identified.

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.
  • 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
  • Embedded script payload in PDF stream info 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xdp/In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.1/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.2/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-locale-set/2.1/In PDF document text
    • http://ns.adobe.com/xtd/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0046.bin pdf-embedded-file PDF EmbeddedFile object 46 at offset 0x7580 85 bytes
SHA-256: c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb
embedded_file_obj0047.bin pdf-embedded-file PDF EmbeddedFile object 47 at offset 0x7632 1526 bytes
SHA-256: f20aceb8dbc16d07642c756ca1ccc141a87f1f44f1a99949a4c6a6a8678b4c98
embedded_file_obj0048.bin pdf-embedded-file PDF EmbeddedFile object 48 at offset 0x7902 6484 bytes
SHA-256: 8185bab13549d61f2e54ba9406b53c095e53a4b56c74efd3095b6098727b4097
embedded_file_obj0049.bin pdf-embedded-file PDF EmbeddedFile object 49 at offset 0x85AF 171 bytes
SHA-256: 0b7fe2cbe79087012463f41fc1327af7a43b4981b1049b2448bcaa170e431454
embedded_file_obj0050.bin pdf-embedded-file PDF EmbeddedFile object 50 at offset 0x8678 4800 bytes
SHA-256: 851068169faaac8fcdfa72571a46fea924d1fb0c33b95225802028dfa0b1c7a7
embedded_file_obj0051.bin pdf-embedded-file PDF EmbeddedFile object 51 at offset 0x8B14 212 bytes
SHA-256: 57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f
font_00_cff_off000012d0.bin pdf-font-stream PDF embedded font (cff) at offset 0x12D0 31178 bytes
SHA-256: 23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0
font_01_cff_off00008c79.bin pdf-font-stream PDF embedded font (cff) at offset 0x8C79 4209 bytes
SHA-256: 8858ca27d73bbc3f4ab6d359de95ac145adb0ce4c6f741c0a97ff105288d4879
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.41, consistent with packed or encrypted content.

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