PDF malware analysis — malicious · caa61de0e807f136

MALICIOUS

PDF

113.6 KB Authoring application: PyPDF2

MD5: 8f9a6b61f35ccdd8ecc8f7a102f2832e SHA-1: 689c840ef76a0da630c90d0868b337a5146fb093 SHA-256: caa61de0e807f136fd3f36d666884d1c2d0b99d8ee5ad30f9b390ac6ccb1287d

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL suggests the script is likely obfuscated and uses eval() to execute its payload. ClamAV detections for Txt.Malware.Nemucod-6769585-0 on both the main file and an extracted artifact confirm its malicious nature. The extracted JavaScript is likely responsible for downloading and executing a second-stage payload.

Heuristics 7

ClamAV: Txt.Malware.Nemucod-6769585-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Txt.Malware.Nemucod-6769585-0
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.
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.
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.
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.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `1e52fbbba9f72b113973c3cc28c85ae16fd00b4f3723255f13b3d9554a7a6dd5`	pdf-javascript-stream	PDF /JS object 4 at offset 0x3D4	66552 bytes
Detection ClamAV: Txt.Malware.Nemucod-6769585-0 Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0004_001.js` `f66a30879068e87cdb32acbb17a1b93ca098c3562763b495c45c5cd157ecc3db`	pdf-javascript-stream	PDF /JS object 4 at offset 0x3D4	62311 bytes

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