PDF malware analysis — malicious · ee3cdb7cd928b2c8

MALICIOUS

PDF

11.3 KB Created: 2010-08-25 22:25:50 +04:00 Authoring application: YhAKH_ (via a0ca286f9)

MD5: 75d829f4674edbb2f45f8415261c2e30 SHA-1: aa5ebd3b293e185942167ab27fd2830b0ef83001 SHA-256: ee3cdb7cd928b2c8c16ffe81bc1146bf0f5830efbeef747cd1cd2a18e5178fe6

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'eval()' call and 'String.fromCharCode' usage within the JavaScript streams suggest the execution of obfuscated code. This code is likely designed to download and execute a secondary payload, a common technique for initial access or further system compromise. No specific family could be identified due to the generic nature of the obfuscation.

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` `4406d6fe51d193741a57c7b03a863e3c76517fe2cb784d0b296d5346cfc4db92`	pdf-javascript-stream	PDF /JS object 11 at offset 0x23DF	1104 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `ba48ccfca53bef45121aaecab19f43340ea638a1891aebb9007db7bac376680e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x265E	486 bytes
`javascript_obj0015_002.js` `df6621e24e941f9533a35d6147e6357bfd6076dc13b5ca39ac5d720a56378c2e`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2800	137 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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