PDF malware analysis — malicious · f1ec49b1fd0dfa71

MALICIOUS

PDF

15.5 KB Created: 2009-09-24 19:41:86 Authoring application: PDF Library 4.9.2 (via PDF Library 6.3.8)

MD5: 56a1b557c4b8097309590ab649569c53 SHA-1: b3b2c5bff1b1230aaef4eb509f55ad05251df62e SHA-256: f1ec49b1fd0dfa71fec469db34f2144ba3efd2935045b16974f4383275230eef

148 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 JavaScript stream, identified as 'javascript_obj0007_000.js', is likely responsible for downloading and executing a second-stage payload, as suggested by the ClamAV detection of 'Pdf.Dropper.Agent-7685843-0'. The use of eval() and String.fromCharCode in the JavaScript points to obfuscation techniques commonly used by droppers.

Heuristics 8

ClamAV: Pdf.Dropper.Agent-7685843-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7685843-0
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` `9b2e6999c7028c9dbe642b1625389eede8817f75c88c38ac08d355acf4aa08fb`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	163425 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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