PDF malware analysis — malicious · ed5723e3bfff9fe4

MALICIOUS

PDF

11.0 KB Created: 2010-08-09 22:51:04 +04:00 Authoring application: g__A9_ (via 4a7a6fd7f3)

MD5: 26856a232a5db5662c1bc815bcdb125f SHA-1: 64cc8604303644fcbf964b91515e890428c87690 SHA-256: ed5723e3bfff9fe4cdc8fa16ffacf3eb0c00c34e753fe9152b65ae24cc05be2c

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristic firings. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests obfuscated code execution. The extracted JavaScript files, particularly 'javascript_obj0011_000.js', are likely responsible for the malicious behavior, potentially downloading and executing additional payloads. The obfuscation makes a definitive family attribution difficult.

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` `d465c3927d97a27fe5378cba0cd6736a6b669c8047cd9e521e49bed1ad2657c9`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2470	522 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `bcba5e4f4026cf2279324908a65bb249ef15e48842db1a8f6f43f01a549eab64`	pdf-javascript-stream	PDF /JS object 13 at offset 0x25DB	193 bytes
`javascript_obj0015_002.js` `7e775a40c528cb076a35870d3e5519b16bc79676bc4bd5607e0af2638b5648fb`	pdf-javascript-stream	PDF /JS object 15 at offset 0x26DC	47 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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