PDF malware analysis — malicious · 8a040d17214ac00d

MALICIOUS

PDF

12.1 KB Created: 2010-10-21 09:44:23 +04:00 Authoring application: jFZXI_t (via 60ad838)

MD5: 8ea83b9ef8ebfbd2ed1163867f34f6f6 SHA-1: 9d76b8b3d37bafa67feb4ad0745842295de66054 SHA-256: 8a040d17214ac00dbbb7a613e091405a0d43404828feec03631c852e0319c8fd

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of JavaScript streams and an eval() call suggests the execution of malicious code. The extracted JavaScript files, though obfuscated, are likely responsible for downloading and executing a second-stage payload, which is a common technique for malware delivery. The file's metadata and the nature of the heuristics point towards a malicious PDF designed to exploit vulnerabilities.

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.
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. (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `70ec2f3150b5a8e9fb6b92828da8ad87c385691e144410fea248b9dae77d39f5`	pdf-javascript-stream	PDF /JS object 11 at offset 0x240B	2424 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `76cd0c2463788c144c205a3aa3d92a5d8cc0ca3c24bbc92202eb3ca4a9674201`	pdf-javascript-stream	PDF /JS object 13 at offset 0x285B	1136 bytes
`javascript_obj0015_002.js` `4ea17f3dba98f08f58185f59c8d20f5c03986f4b64f9c8c56b02a0cd7edff1ad`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2ADA	295 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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