PDF malware analysis — malicious · fcfef22091e54571

MALICIOUS

PDF

12.1 KB Created: 2010-12-02 19:16:35 +03:00 Authoring application: N_Ew___ (via a0e2a)

MD5: fff6b1a98abf4f5473503ddb8edd460a SHA-1: 50b85bb66a0873623f79545acf0bde679db224e9 SHA-256: fcfef22091e54571abf50fbf3db76aacbae8ba323e1cc25173d62e377ecb211b

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple embedded JavaScript streams, with critical heuristics indicating the use of eval() and String.fromCharCode, suggesting obfuscated code execution. ClamAV detection as 'Pdf.Dropper.Agent-1588540' strongly indicates its malicious nature as a dropper. The presence of JavaScript actions and streams points to an attack pattern involving the execution of malicious scripts to download and execute a second-stage payload.

Heuristics 7

ClamAV: Pdf.Dropper.Agent-1588540 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1588540
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` `978cca184dddee691118adf9dc80a794a88057cfea624090646d751e88684dfb`	pdf-javascript-stream	PDF /JS object 11 at offset 0x242E	2435 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `070ca0595f6e6ffbf1e61d8eaa83a67cd9fcb18c6ba7bb66e41352009b133b16`	pdf-javascript-stream	PDF /JS object 13 at offset 0x2881	1101 bytes
`javascript_obj0015_002.js` `ff025d7f785eff0f329b3bcc504f726e8d578a181f3f5b22b466ba857c6f64d9`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2AF3	334 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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