PDF malware analysis — malicious · a5495aceaf0cff11

MALICIOUS

PDF

10.9 KB Created: 2010-08-17 16:02:05 +04:00 Authoring application: ibrKoiT (via 40f4d)

MD5: 4a7c49eae97f8a4740e3495a4fbb11a0 SHA-1: fd2aa559e6382a7817ae812f022d9232b12a78ec SHA-256: a5495aceaf0cff11860872f4dbbf82a8f0c0e58d6543e6931fa83bd6ddfad4dc

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript streams, with one stream exhibiting an eval() call and another using String.fromCharCode, indicating obfuscated code execution. The presence of JavaScript actions and embedded JS streams strongly suggests the exploitation of a PDF vulnerability to run malicious scripts. These scripts are likely designed to download and execute further payloads, a common technique for initial access.

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` `1e16d3cbdac751eefefc3480bbf55250abf876240f22f4db0e00bd016338bbab`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2441	504 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 0x25A8	193 bytes
`javascript_obj0015_002.js` `82dc48f5d8ba75bbf33cd6d7140e2cca4b16f535f57c943be3c8d11e2d17ba28`	pdf-javascript-stream	PDF /JS object 15 at offset 0x26A9	45 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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