PDF malware analysis — malicious · aafc47bb70fba85a

MALICIOUS

PDF

10.4 KB Created: 2010-07-02 20:47:41 +04:00 Authoring application: rf1514 (via f82a944)

MD5: 7803d9a708e24430cec416efba5f27ba SHA-1: 45d6bfa14cb349acbf5f578117200ced6c3c5a06 SHA-256: aafc47bb70fba85a21eec1eabe434335876e13f705826432c8be40cdd92b7a3c

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript streams, with heuristics indicating the use of eval() and String.fromCharCode, suggesting obfuscated code execution. One of the extracted JavaScript files, 'javascript_obj0011_000.js', is likely responsible for the malicious activity. The presence of JavaScript actions and embedded JS streams points towards an exploit targeting PDF viewers to run arbitrary code. The primary intent appears to be downloading and executing a secondary payload.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `79267c7634e88122184bd1b46897fddc3c5f310054b3780d50e10d5ccea6ab29`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2257	673 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0015_002.js` `97f338fcc37ae5472e2614ca4916d1be3e9622e547c5ee4588b5b7a5060ce18f`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2498	36 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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