PDF malware analysis — malicious · e4e86c249b8bfaed

MALICIOUS

PDF

10.9 KB Created: 2010-08-01 00:38:58 +04:00 Authoring application: c_wf_m (via 5f8a45)

MD5: 2a89997fa0adb5d5a501b77d42c5039e SHA-1: ffce0616f7bc22ac92a38fda91befa84ceafadab SHA-256: e4e86c249b8bfaed79a485fdc6e339e7c53887ba86a967c41e0cb3fbf5537fc5

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, with one stream exhibiting `eval()` and `String.fromCharCode()` calls, indicating obfuscated code execution. The presence of JavaScript actions and embedded JS streams, along with heuristic firings for script obfuscation, strongly suggests the document's intent is to download and execute a malicious payload. The specific JavaScript content could not be fully deobfuscated to determine the exact payload or persistence mechanism.

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` `eccb8aec567a28862532835b2a204f9447a517522c0b0345cb17d058e96d8c91`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2413	501 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 0x2577	193 bytes
`javascript_obj0015_002.js` `4c4b232ad0b65f2a271e4c805a331feae325a556bb9aa5e46280edc7df150d22`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2678	46 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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