PDF malware analysis — malicious · 830749674d3722a6

MALICIOUS

PDF

33.6 KB

MD5: 074e723230db0ce089c42d7610a547cb SHA-1: 0b58cb108290f2f39f7587d6e528830e033c7db7 SHA-256: 830749674d3722a62078ec2e879aff010c2048b55a9c414157f66076feb4e251

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File Execution: Malicious Code

The PDF file contains embedded JavaScript that utilizes a heap spray technique, a common method for exploiting vulnerabilities in PDF viewers. The 'PDF_XFA_HEAP_SPRAY' heuristic firing strongly indicates this malicious behavior. The embedded JavaScript, 'stream_000_off00000057.js', is the primary artifact responsible for the exploit. The ClamAV detection further confirms the malicious nature of the file.

Heuristics 7

XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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
`stream_000_off00000057.js` `3b59cfe25a53f762ad0d3fb68b15ad10d0f6814e81f6a012c3c904640cebb02e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x57	84864 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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