Malicious PDF — malware analysis report

Static analysis result for SHA-256 204bea0362658807…

MALICIOUS

PDF

30.9 KB Created: 2013-01-23 15:35:50 +03:00 Authoring application: Adobe Designer 7.0
MD5: 1d8860bdbd2601cf32e49569508fa941 SHA-1: a850af9a534645441e90d455a3cdb36b37b44625 SHA-256: 204bea036265880726a5fca12f877e6f84ebe9b936281899c7bbccdfde4553aa
134 Risk Score

Malware Insights

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

The PDF file contains multiple embedded JavaScript streams and embedded files, indicating a complex malicious structure. The high-confidence heuristic 'PDF_XFA_SCRIPT' specifically flags risky executable script within an XFA form. This suggests the script is designed to exploit a vulnerability, likely to download and execute a secondary payload from one of the embedded files. The presence of multiple embedded files further supports this, as they could serve as the payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 10

  • 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 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
  • 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#
    • 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 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0028.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 28 at offset 0x257F 85 bytes
embedded_file_obj0029.bin
e0092de902c56590f704951aaaca149b1d7b8f021514c930acc8c4849b18f0b0		 pdf-embedded-file PDF EmbeddedFile object 29 at offset 0x2631 1182 bytes
embedded_file_obj0030.bin
9acbf3604f01c3f908c5464ee6ccb4af9df6a219406bdc78e82c0f28e1a5daa7		 pdf-embedded-file PDF EmbeddedFile object 30 at offset 0x2881 9131 bytes
embedded_file_obj0031.bin
0b7fe2cbe79087012463f41fc1327af7a43b4981b1049b2448bcaa170e431454		 pdf-embedded-file PDF EmbeddedFile object 31 at offset 0x3822 171 bytes
embedded_file_obj0032.bin
ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd		 pdf-embedded-file PDF EmbeddedFile object 32 at offset 0x38EA 2427 bytes
javascript_obj0020_000.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 pdf-javascript-stream PDF /JS object 20 at offset 0x1E08 870 bytes
javascript_obj0022_001.js
4e139c8b22ec16bd5aa51575c80dec2bbf89b76977a06b68473031a0eb206366		 pdf-javascript-stream PDF /JS object 22 at offset 0x1F8C 2794 bytes
javascript_obj0024_002.js
c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a		 pdf-javascript-stream PDF /JS object 24 at offset 0x227B 1528 bytes
font_00_cff_off00003cba.bin
0ae41b450cb5b4dbaad95b749403e081d0248df2726b0ca72bad3f2c04ed0fe1		 pdf-font-stream PDF embedded font (cff) at offset 0x3CBA 6681 bytes
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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