PDF malware analysis — malicious · 2841822e90d5e10f

MALICIOUS

PDF

37.3 KB Created: 2010-01-25 16:34:04 +03:00 Authoring application: firstDuring (via a43cf1bfb47754486720d964df63425b)

MD5: 521e38ab2e2ff925b2f41efd6f02f46a SHA-1: 06a9b091fa2c5fc3fd96693fcbc934a4013c9caf SHA-256: 2841822e90d5e10fea66ea22270aca20e7e1c29d3c6a4dbd9f7a7b6a02cdfd69

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream is obfuscated and uses eval(), suggesting it's designed to execute malicious code. The presence of a suspicious extracted artifact named 'javascript_obj0024_001.js' further supports this. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact URL or payload is not directly discernible due to obfuscation.

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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_obj0022_000.js` `77c76d271fdc63bb22f05486086ce004a1e1ca8cfeca3b535983a44545264fcf`	pdf-javascript-stream	PDF /JS object 22 at offset 0x2C6C	35575 bytes
`javascript_obj0024_001.js` `076d154bc3f55a1a4e3d60c74ad4e1dcbcee46e969cdd81b74610ea0d317166c`	pdf-javascript-stream	PDF /JS object 24 at offset 0x89E7	1394 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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