Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d449487010180bc…

MALICIOUS

PDF

85.4 KB Created: 2010-11-25 09:55:07 +01:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 9.4.0 (Windows))
MD5: 1778ebd1294ed8f120ff88a0b3b5b20b SHA-1: a826859b4577540dced73ec6ab91bf51182ae11a SHA-256: 5d449487010180bc70e20124e0df5cb95e3af527f4aeb3290d0feeecae63aaaa
130 Risk Score

Malware Insights

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

The PDF file contains multiple embedded JavaScript streams, with one stream (javascript_obj0015_005.js) being particularly large and containing code that appears to be designed to prompt the user for identity information during a form submission. The critical heuristic 'PDF_JS_EXPLOIT_CLUSTER' combined with 'PDF_UNESCAPE' strongly suggests the presence of exploit code within the JavaScript, likely intended to download and execute a second-stage payload. The document's structure and the presence of form-related JavaScript point towards a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3643

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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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.
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/AcrobatAdhocWorkflow/1.0/
    • http://www.iec.ch

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0158_000.js
c6b172ba51802ff2639cb5178bfa7a533c4872cfbf6f3259d912fb1d888be5b3		 pdf-javascript-stream PDF /JS object 158 at offset 0x11D68 36 bytes
javascript_obj0160_002.js
034750736c197f8060952350cc63a9f3f00fb5ded4680a13bb0c4c93e04b0ef1		 pdf-javascript-stream PDF /JS object 160 at offset 0x11DFE 33 bytes
javascript_obj0187_003.js
6b2423fd692d24d609918beda4e671489a14f60e68111bf7b6e8128d77637f7f		 pdf-javascript-stream PDF /JS object 187 at offset 0x125C0 133 bytes
javascript_obj0007_004.js
4a3be1c97fa660c78458adbf8467d9ef0ece4b4be6574ddb6a76861e566be29f		 pdf-javascript-stream PDF /JS object 7 at offset 0x13D57 999 bytes
javascript_obj0015_005.js
54ecd84dfc7467ca4c73bc23ef1cc5bd6a447368e2c258ba91c02863e8de8987		 pdf-javascript-stream PDF /JS object 15 at offset 0x48AF 11487 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
javascript_obj0189_006.js
0161aa5da6a35671e6ce130296afd45716ccebf59c5c4530960cf7d523e5f7f1		 pdf-javascript-stream PDF /JS object 189 at offset 0x1269F 2430 bytes
icc_00_off0000d739.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0xD739 3144 bytes
font_00_cff_off0000e707.bin
18cf36ce0f4ea6dd2512a601755c33810fcbd816c90004304813a51e2e89cf47		 pdf-font-stream PDF embedded font (cff) at offset 0xE707 5422 bytes
font_01_cff_off000100bc.bin
5c38ca27a125b032bf8069c8ff9b2b6fc1f70a72ce37e9076d6ff78f6d02f18f		 pdf-font-stream PDF embedded font (cff) at offset 0x100BC 5330 bytes
font_02_cff_off000117d1.bin
4653ffb3b5729917c2e4eff2f1dbb5aa202c8470d31bfacab0a2380b4234524e		 pdf-font-stream PDF embedded font (cff) at offset 0x117D1 766 bytes

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