Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a0e0656d956033…

MALICIOUS

PDF

32.2 KB
MD5: 4d900620d159f800b59010a4b36ca81c SHA-1: 3043d8580efa63b5ba68b3ddc1a773485805b205 SHA-256: 42a0e0656d956033a651f6d6324e7b5041eb4177def4a58fbc6e680cc1ceb5f7
128 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript itself is heavily obfuscated using String.fromCharCode and concatenation, making its exact function difficult to determine without further deobfuscation. However, the presence of eval() and the overall structure strongly suggest it's designed to download and execute a secondary payload. ClamAV detection as 'Pdf.Dropper.Agent-7254772-0' further supports this dropper-like behavior.

Heuristics 7

  • ClamAV: Pdf.Dropper.Agent-7254772-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7254772-0
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0005_000.js
b52e64cd30eaf02315341f72610a4fc41e5a9d931c05c574526744d724d16009		 pdf-javascript-stream PDF /JS object 5 at offset 0x162 32354 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0005_001.js
0da35fc0c3388e831105c25176d67f80763c4e5cca1d9e4812c729d16b41ef76		 pdf-javascript-stream PDF /JS object 5 at offset 0x162 48 bytes

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