PDF malware analysis — malicious · d955b2df81cff736

MALICIOUS

PDF

15.0 KB Created: 2009-09-19 19:44:86 Authoring application: PDF Library 6.2.6 (via PDF Library 3.4.5)

MD5: 5d7fa464d5d85b67410a68c24459a746 SHA-1: 62a1394b8bc6f29c7985bdcccffe2836004c62fe SHA-256: d955b2df81cff736704d74a2472f13840dbcf900ae3183de65181221bf86de29

88 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 presence of an eval() call and String.fromCharCode() suggests the script is likely obfuscated and designed to execute arbitrary code. The differential parser failure also indicates potential structural manipulation. The primary attack pattern involves exploiting PDF vulnerabilities to run malicious JavaScript, which is then likely used to download and execute a secondary payload.

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` `5e3cbc4ec1707234d4f6df1f7a609eb78c7fbe3b7e46efd80d7afddff6874c77`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	159359 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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