PDF malware analysis — malicious · b2a6edf15f132e0a

MALICIOUS

PDF

12.2 KB Created: 2010-08-24 14:57:57 +04:00 Authoring application: u_dXQRs (via 795fa27ba9)

MD5: 5c9cdeba08cb9dbf73aaf8da3b68708d SHA-1: bdd7da4484c8806fa31e66eb270eb03a9cc01bea SHA-256: b2a6edf15f132e0a112b81be05d8f2acf1b1054e0f32b32884a81c3743ea9c8a

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of `eval()` and `String.fromCharCode` suggests obfuscated JavaScript code designed to execute arbitrary commands. The extracted artifacts, javascript_obj0011_000.js, javascript_obj0013_001.js, and javascript_obj0015_002.js, are likely part of this malicious script. The primary function of this script appears to be downloading and executing a second-stage payload, 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` `b83db037e61385331827a4c1fc3bb9da4ef2d3a20cc0461c5d139081bdb4a0a7`	pdf-javascript-stream	PDF /JS object 11 at offset 0x245A	2419 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `7ed76219aceb59181d8336c60940225b48ab8103efcaf400c2c6e287974fbbd2`	pdf-javascript-stream	PDF /JS object 13 at offset 0x289C	1119 bytes
`javascript_obj0015_002.js` `b40c766f16f4366348946c92042e100cf79e681ef06ab5062e17d87c9c82564e`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2B1C	296 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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