Malicious PDF — malware analysis report

Static analysis result for SHA-256 27de13b9f57d2ec3…

MALICIOUS

PDF

56.3 KB Created: 2017-06-22 13:05:25 +03:00 Authoring application: iTextSharp’ 5.5.10 ©2000-2016 iText Group NV (AGPL-version)
MD5: 37a289ab39e88b0156917ff620f3a22a SHA-1: ed8804d0c8bc564146db9e9f6a8ab0eaa0355a11 SHA-256: 27de13b9f57d2ec30bb0b90cd7d470818f026b0049af81f96210ad6d731b0f95
176 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Dropper.Agent-7138983-0'. An embedded artifact was also detected by ClamAV as 'Doc.Downloader.Jaff-6329915-0', indicating it likely functions as a downloader for further malicious content. The presence of JavaScript actions and embedded JS streams further supports its role as a malicious dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-7138983-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7138983-0
  • 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.
  • 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
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
000812220195.docm
d5c88c505e51caa5f07cfb8cafa8e4a71f21e40974310cc35c8ce44df5f29375		 pdf-embedded-file PDF EmbeddedFile object 2 at offset 0x968 67089 bytes
Detection
ClamAV: Doc.Downloader.Jaff-6329915-0
Obfuscation or payload: unlikely
javascript_obj0004_000.js
4f09a25e674b542de6e0ade5d8f7bb933caa151f1b152345b8a13a41b1a0c986		 pdf-javascript-stream PDF /JS object 4 at offset 0xDC72 107 bytes

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