PDF malware analysis — malicious · 3b8436512a13ab01

MALICIOUS

PDF

73.5 KB Created: 2015-07-23 23:22:36

MD5: 0f3f32ed91ffac18827af99740c6e256 SHA-1: 9052d13d049e078b4d8e30260036f39436c575c0 SHA-256: 3b8436512a13ab0145f919b0c7855f409bee5146ef931c4ef86819fe0f05acbc

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple embedded JavaScript streams, indicating an attempt to execute malicious code. The primary heuristic firings point to the presence of JavaScript and embedded files, with one embedded PDF child also exhibiting suspicious static findings. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_IMAGE_ONLY_LURE heuristic suggests a deceptive lure, possibly to trick the user into interacting with the document.

Machine Learning

Nyx PDF Classifier suspicious score 0.2728

Heuristics 5

Embedded PDF child has suspicious static findings high PDF_EMBEDDED_CHILD_STATIC_TRIAGE

PDF contains an embedded PDF stream whose extracted child matches suspicious or malicious PDF heuristics. Wrapper PDFs are commonly used to hide the actual exploit or lure payload from scanners that do not recursively inspect attachments.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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. (matched inside decoded 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)
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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `546f84dc1aa58a4dcd8606b248b179eb319bfafc6e296b4d1e4c45401240ad45`	pdf-javascript-stream	PDF /JS object 5 at offset 0x1B7	249 bytes
`javascript_obj0016_001.js` `e8de1a84b26408a277abd22d1d096c119e198344ccce7fac267798e2945ec317`	pdf-javascript-stream	PDF /JS object 16 at offset 0xDC8	232 bytes
`javascript_obj0019_002.js` `7f20df2e03d6932a34b3e75d6a08b685b7fee9f3237cef5b9493fec1b76708e3`	pdf-javascript-stream	PDF /JS object 19 at offset 0x100E	153 bytes
`javascript_obj0024_003.js` `3da19bcfa12dbc532429619047b898e0f3bf7ddc708a614effc2b69cbb3536e2`	pdf-javascript-stream	PDF /JS object 24 at offset 0x1E0D	4859 bytes
`javascript_obj0016_004.js` `6cb8e470d51246ef917aee654d05a4087ac4b90b76db7bf88bb87965c1904f68`	pdf-javascript-stream	PDF /JS object 16 at offset 0x1267	8668 bytes
`javascript_obj0024_006.js` `15b8cb29e0de1949d246d64091e44c9a256b91f4ec749268cf8743bb5c1ef733`	pdf-javascript-stream	PDF /JS object 24 at offset 0x1E30	5651 bytes
`peepdf.pdf` `e9958b248574775e32c8bd6d2a38f1689a1ec9124f1c62e5f887ec3fe93830b5`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xF40D	13379 bytes

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