PDF malware analysis — malicious · 8bbc213a35ca3e2e

MALICIOUS

PDF

4.0 KB

MD5: 833096970c41ffa76b4e4712c990a4f8 SHA-1: ff5281ba1181f7d47426083ceea9b2d2961426a9 SHA-256: 8bbc213a35ca3e2ee24ea818d2d3d1641accba5823aff47f7d423bd5174ffccd

126 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 and PDF_JS. The critical ClamAV detection of 'Pdf.Dropper.Agent-7685802-0' strongly suggests its malicious nature. The presence of eval() calls and String.fromCharCode within the JavaScript points to obfuscation techniques used to hide the execution of a second-stage payload, likely a downloader. The extracted JavaScript files, 'javascript_obj0013_001.js' and 'acroform_b64_00.js', further support this, with one being identified as a deobfuscated JS stream. The overall pattern is consistent with a malicious PDF dropper.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7685802-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7685802-0
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)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `114927df7913fe0c0f6c5d93e8320a0cf08c4fba55182fd1af9e8661a8c6429a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6333 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `43a16e7b1e256cb086cff912b558bf4cc836e713979cf52f3a0f77e5da67517f`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3596 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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