Malicious PDF — malware analysis report

Static analysis result for SHA-256 7530642e4a7bcaba…

MALICIOUS

PDF

189.8 KB
MD5: cfc04db89c505bd67df442007dfaebd7 SHA-1: ecbcd23151019cb5ac08bdf93429552ffa000ae2 SHA-256: 7530642e4a7bcaba3ac227a85354c81f9a40685ee1e2caa1a42ce3a1f8e14af0
110 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, identified as a critical exploit cluster targeting XFA forms. This script is likely responsible for downloading and executing a secondary payload from a remote source. The presence of an unknown URL suggests a potential command and control or download destination.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4511

Heuristics 8

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • 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.
  • 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. (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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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 https://www.services-publics.lu/assistants/public-defo?ECITIZ_ACTIVITY_PATH=Usager&amp;ECITIZ_PROCESS_ID=MULT-DEFO&amp;FORM_TYPE_ID=AEV_VFE_FR In PDF document text
    • http://www.adobe.com/products/acrobat/readstep2.htmlIn PDF document text
    • http://www.adobe.com/support/products/In PDF document text
    • 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/pdf/1.3/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/xfa/promoted-desc/In PDF document text
    • http://cgi.adobe.com/special/acrobat/updateIn PDF document text
    • http://www.xfa.org/schema/xci/2.6/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.6/In PDF document text
    • http://www.w3.org/1999/xhtmlIn PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://get.adobe.com/readerIn PDF document text
    • http://www.xfa.org/schema/xfa-locale-set/2.6/In PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000350.js
f94e41f586bf3f20bc1deeac4bfbda388a61db43f25fbd6304ba73f5653368cf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x350 1313 bytes
stream_003_off0000052e.js
1b2ec98752b966f601d5223a750559cf13d562ac5e5c6d1fcc7217835b01f5fd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E 902 bytes
stream_008_off00000f29.js
772ac512746cb20de36e38c383a3c6323e8ef8340093296955c0ca0d15b2596c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF29 1976 bytes
stream_009_off00001283.js
8b961deedb102094fc4de061c388022bbb7d3eb89a33675e6f2d9e6f3a7db2e6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1283 421393 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
stream_010_off0002aa36.bin
02816c26df8d4b33210e88ed26c5bfdf92e8d642032c682bf9ab3c97429c88de		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2AA36 5547 bytes
stream_011_off0002adb9.bin
90938f9e3cdf6db2eeee31ed7c949f3b0952b799b670df73d2e56d31bfcc8d34		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2ADB9 121 bytes
objstm_0039_00.bin
1169f0f9bc256258f6996829c323c18d7282a5f67e2f08a102d981cb3b1247f4		 pdf-objstm-decoded PDF /ObjStm 39 0 obj (inflated) 617 bytes

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