PDF malware analysis — malicious · 675bcfdb06533fa7

MALICIOUS

PDF

10.9 KB Created: 2010-07-31 00:02:48 +04:00 Authoring application: vc_k2K (via 9e1a510b)

MD5: a249be99ae42f2fdbd49002cc1e0739c SHA-1: 020eba1c205c2a208f788dac221745c0555e14cf SHA-256: 675bcfdb06533fa72debb2bb59a0993a86c5df8eb593c3b654c4ff0ccab15423

224 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript that is heavily obfuscated using character code manipulation and XOR encryption. The script reconstructs a string using `String.fromCharCode` and then decrypts it using an XOR key 'BMCe___'. The final reconstructed and decrypted string is then executed using `app.doc.eval()`, indicating an attempt to run arbitrary code. This behavior is consistent with a dropper or downloader malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 8

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Dropper.Agent-5341879-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-5341879-0
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` `584a379a51e5e5732fbf24289dd3af29748f22be340f7e927515cd2631e05cee`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2406	509 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 0x256E	193 bytes
`javascript_obj0015_002.js` `dd5008766ec011fddcadbc207cc7b9edb6eb9878d7930ccdf4a40a05dc28e01e`	pdf-javascript-stream	PDF /JS object 15 at offset 0x266F	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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