Malicious PDF — malware analysis report

Static analysis result for SHA-256 885bd96ac8580fb9…

MALICIOUS

PDF

36.6 KB Created: 2020-05-28 08:01:27 UTC Authoring application: Adobe XML Form Module Library
MD5: db27b229546c0a5882acfe4e41093576 SHA-1: 1532d0361a7fcf31670b97ea00bbf3249cd83713 SHA-256: 885bd96ac8580fb9a330e0136fd76c7bff4793823a7436b94f3d36f136db6753
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file utilizes XFA forms and embedded JavaScript, triggering heuristics related to PDF JavaScript exploits. The JavaScript code constructs a URL, "http://cgi.adobe.com/special/acrobat/update?p=<platform>&v=<viewer_version>&l=<language>&c=<viewer_type>&w=XFA1_6", which is presented to the user as a prompt to update their Adobe software. This is a common lure to trick users into downloading and executing a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 8

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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
  • Embedded script payload in PDF stream low 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.
  • 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/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xfa/promoted-desc/
    • http://cgi.adobe.com/special/acrobat/update
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-xliff/1.0/
    • http://www.w3.org/1999/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://www.xfa.org/schema/xfa-template/2.2/
    • http://www.xfa.org/schema/xfa-connection-set/2.1/
    • http://www.xfa.org/schema/xfa-locale-set/2.1/

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0144.bin
f7ee3ef2f8f35d669a6c2b8b0b0ee89655bbc3d04b107a8d22531830f6fc28a1		 pdf-embedded-file PDF EmbeddedFile object 144 at offset 0x31B2 86 bytes
embedded_file_obj0145.bin
e6a2b0dc3ef171185353c4737146e682e9edceb62596bef89ebfdc72f91cee8c		 pdf-embedded-file PDF EmbeddedFile object 145 at offset 0x3267 12176 bytes
embedded_file_obj0146.bin
050efdb619ffa1429e175889159e85241242a93369ce18a06795e0a3c78f828b		 pdf-embedded-file PDF EmbeddedFile object 146 at offset 0x3C41 63536 bytes
embedded_file_obj0147.bin
90c584af20b8880893715c906a240ed23deca5a0411aa357eceaeecb47f19db7		 pdf-embedded-file PDF EmbeddedFile object 147 at offset 0x5C7C 216 bytes
embedded_file_obj0148.bin
0db90c3e08846a38038397ec4d89bba503e19c0a43bcc3cf5c0f4bd8296de234		 pdf-embedded-file PDF EmbeddedFile object 148 at offset 0x5D75 2379 bytes
embedded_file_obj0149.bin
b76b62d5c782960be6d764bbba905838b274ce74ddf1774d8abaf7902737006a		 pdf-embedded-file PDF EmbeddedFile object 149 at offset 0x604E 1813 bytes
javascript_obj0141_000.js
f574e4d51594d1a8fd22e125b109b827c437aa898edc78babb62dbb93f8744f8		 pdf-javascript-stream PDF /JS object 141 at offset 0x2B5F 1532 bytes
javascript_obj0142_001.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 pdf-javascript-stream PDF /JS object 142 at offset 0x2D4A 870 bytes
javascript_obj0143_002.js
826c5622c798d67e5281cca7e05933dddc90ccdcb0a6177c9f7d06f11bef8f7f		 pdf-javascript-stream PDF /JS object 143 at offset 0x2EA4 2795 bytes

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