PDF malware analysis — malicious · b7da07fcddf956be

MALICIOUS

PDF

4.0 KB

MD5: 4cfe02a9cfac57e6ba1415300031b689 SHA-1: 502fab5b9dbd9094b18d1dc9167d38ea24b9266e SHA-256: b7da07fcddf956be53fdcd9fc72ec819b8e40fad15f84d876484ed27ec68d153

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 PDF_EVAL heuristic firing, along with the presence of deobfuscated JavaScript streams, suggests that the embedded script is designed to execute arbitrary code. The ClamAV detection of 'Pdf.Dropper.Agent-1828917' further supports that this is a dropper mechanism. The script likely downloads and executes a second-stage payload, although the specific URL or payload is not directly extractable from the provided evidence.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-1828917 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828917
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` `02b230189f3928ca742843e62e54801ef64458c79f3384d5675e62a5368375a1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6273 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` `12d4ac69fa1a71270f38c9c15644742c30fd1c27b6470f0ddff844d9a349f949`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3550 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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