PDF malware analysis — malicious · 9e99a30b4b1cde9b

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6

MD5: 19607e73fd8a2b163ccf1bb38397786b SHA-1: 8a7be608beae6411c28fc21e30d74cc42d1b0af5 SHA-256: 9e99a30b4b1cde9b4b61bf8f33bdd5760685e37e21b8cc973f8bd08bbddcd32e

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment

The file is a PDF document that has been flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Agent-36874'. The presence of XFA forms and AcroForm buttons with action triggers suggests an attempt to exploit PDF vulnerabilities. The ML classifier also strongly indicates maliciousness. The document body contains obfuscated text, and an embedded binary artifact was found, further supporting the conclusion that this PDF is designed to deliver an exploit.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

Heuristics 4

ClamAV: Pdf.Exploit.Agent-36874 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36874
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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
`stream_001_off000008ed.bin` `47902ae5b2977fc888737a1ef86aa768f2181894213e783d926d0fbad091beea`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1400 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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