Malicious PDF — malware analysis report

Static analysis result for SHA-256 127ca4622bb42f44…

MALICIOUS

PDF

105.9 KB Authoring application: cairo 1.6.0 (http://cairographics.org
MD5: 1c64a5cfdc60f3397d496111996d8f20 SHA-1: f2894bfc305733376c09a2c9e86be4f829ef075c SHA-256: 127ca4622bb42f442371b24df022dfe86483398f7f6b5da7f5feb33874be50c7
578 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript that triggers a launch action, specifically targeting cmd.exe. This action is designed to execute an embedded Windows executable payload, which is disguised as a PDF file named 'hunt.pdf'. The embedded payload was detected by ClamAV as 'Win.Trojan.ShellcodeReverseTcp-1', and the PDF itself was flagged as 'Pdf.Tool.Agent-1388586'. The combination of these factors strongly indicates an exploit targeting client execution via a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 15

  • Adobe Reader Launch action command execution critical CVE exact CVE_2010_1240
    PDF uses the Adobe Reader/Acrobat Launch action pattern associated with CVE-2010-1240: cmd.exe is invoked with attacker-controlled parameters, paired with an embedded/exported payload.
  • Launch action critical PDF_LAUNCH
    PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
  • Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD
    PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
  • /Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\\hunt.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • Embedded attachment masquerades: declared document, content is windows-executable critical PDF_EMBEDDED_FILESPEC_CONTENT_MISMATCH
    An /EmbeddedFile attachment's declared filename extension or /Subtype MIME type contradicts the magic bytes of its decompressed content. The attachment is declared as a benign document or image but the bytes are an executable or executable-bearing archive. This is a deliberate deception used to hide droppers in PDF attachments and is a generic indicator of embed-and-drop weaponisation, independent of any specific CVE.
  • ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • /Launch action paired with attachment-dropping JS API high PDF_LAUNCH_PLUS_DROPPER_JS
    PDF combines a /Launch action with a JavaScript API call that writes or opens an attached/external resource — the canonical shape of the CVE-2010-1240 /Launch + exportDataObject family. Benign PDFs do not pair these surfaces; the combination indicates a drop-and-execute chain regardless of the specific JS API knobs or /Launch target.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 105 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://cairographics.org
    • http://www.islamic���nder.org/prayerPrintable.php?ci
    • http://fontforge.sf.net/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
hunt.pdf
74792ca3b2cce6cd6fa449b03647bdb25c256e5bdb1e45236e73fbec164f02f2		 pdf-embedded-file PDF EmbeddedFile object 41 at offset 0x156CB 37888 bytes
Detection
ClamAV: Win.Trojan.ShellcodeReverseTcp-1
Obfuscation or payload: unlikely
javascript_obj0042_000.js
0936a722b1e636b8904ef1e71f08b435ec468fe32619e4c4892873478c9950f5		 pdf-javascript-stream PDF /JS object 42 at offset 0x1A385 53 bytes
font_00_sfnt_off0000b702.bin
9b48535711020170a420dff008fe74a1d93c66af001334dbe9e52c224e3cb6d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB702 9380 bytes
font_01_sfnt_off0000d6f9.bin
3a93441f7e18e339c882d060bf563817012c77f64beae73ae000eaeca8c463b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 5856 bytes
font_02_type1_off0000ed2b.bin
2fb2644c2ee4ebae75bde1dcf7813417b6f3bac82d663207468e544467c29587		 pdf-font-stream PDF embedded font (type1) at offset 0xED2B 25284 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.97, consistent with packed or encrypted content.

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