PDF malware analysis — malicious · ac6207c9e4b86812

MALICIOUS

PDF

16.0 KB Created: 2009-09-30 19:41:53 Authoring application: PDF Library 1.10.4 (via PDF Library 10.5.5)

MD5: 8d7aa1f3f9a226e3d469fb38a3a9fa73 SHA-1: 07389decab7a957929c41d7d2d21034717d56be1 SHA-256: ac6207c9e4b8681294edb96771dd4c24e58db821aca89c66266a49e3d04aeba0

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to execute arbitrary code. The primary function of this script appears to be downloading and executing a secondary payload, as evidenced by the PDF_EVAL and PDF_FROMCHARCODE firings. The differential parser failure also suggests a potentially malformed or intentionally complex structure designed to evade analysis.

Heuristics 7

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `d86d052ffcf8032e11fe45acf8984251f18e10b4496315a5f707f1494e36c7a9`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	172995 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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