PDF malware analysis — malicious · 1c722f684852709e

MALICIOUS

PDF

14.5 KB Created: 2009-09-19 19:43:98 Authoring application: PDF Library 5.4.4 (via PDF Library 5.1.7)

MD5: 4c830eeb95f88d2ea5a357965b88ee86 SHA-1: 3cf7bef89d71add56fed9b6c7f4faf007ad5d169 SHA-256: 1c722f684852709ed7c5496cb023b8d75357edd8f70c8091d116e41d129226b5

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscated code execution. The primary heuristic firings point to JavaScript actions and embedded JS streams within the PDF. The differential parser also failed, suggesting potential evasion techniques. The extracted artifact 'javascript_obj0007_000.js' is highly suspicious and likely contains the malicious payload. The script's obfuscation and use of eval() suggest it is designed to download and execute a second-stage 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` `b1df1613273c7d217d8179fbc2ae0a732d0cf3af23d1ee37182079177d4e3ba4`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	119989 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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