Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc1f6f0bf72ed8b…

MALICIOUS

PDF

36.0 KB First seen: 2022-03-29
MD5: d81bb61b36338642514c28ed6ee9a8ec SHA-1: 7e3458a4da76041b175a33badc3e8875ac0e2b22 SHA-256: 8fc1f6f0bf72ed8b3aa27852afbec1e923f6215afb26a55dfc45c6a59b585b13
106 Risk Score

Malware Insights

MITRE ATT&CK
T1553.005 Mark-of-the-Web Bypass T1204.002 Malicious File

The PDF contains JavaScript and an embedded file, indicating a potential multi-stage attack. The JavaScript action and embedded file suggest the PDF is designed to trick the user into executing a secondary payload. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of the lure, but the presence of these elements strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4138

Heuristics 6

  • 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)
  • exportDataObject + nLaunch — embedded-file launch-on-open dropper critical PDF_JS_EXPORT_LAUNCH_DROPPER
    PDF JavaScript calls exportDataObject() with nLaunch set, which extracts the document's embedded file and launches it in its default application. This is a launch-on-open dropper: the embedded file is the payload. No benign workflow auto-launches an extracted PDF attachment. (matched in decompressed stream)
  • 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)
  • Suspicious extracted artifact medium 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 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 2 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.

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0028.bin pdf-embedded-file PDF EmbeddedFile object 28 at offset 0x3D44 21859 bytes
SHA-256: 9a2a866fb88d72d025f7a4ced53bfcade0a97f6ceb4610c5e028f7c21e6ada4a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
actual_type=ZIP; declared_or_context_type=PDF; filename=embedded_file_obj0028.bin; kind=pdf-embedded-file
stream_010_off00008c67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8C67 979 bytes
SHA-256: a60d35cc4c5968fe2befbe571285269da2784374f272752934ed1f1fa631145f

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