PDF malware analysis — malicious · f4bbc0cb7f410c81

MALICIOUS

PDF

33.6 KB

MD5: 9e641fd3ad123f9166ce7a9acddadd7f SHA-1: 131477c701714ec8839df551c10f21340c8f43b4 SHA-256: f4bbc0cb7f410c81f492bfb3bc108a9dd6e8189b1f5fff816a21656c13cce438

160 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious Link: Malicious File

The PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. The heuristic 'PDF_XFA_HEAP_SPRAY' indicates that exploit code was found within an XFA JavaScript heap spray. Additionally, 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and the extracted JavaScript file 'stream_000_off0000005b.js' confirm the presence of embedded script. This script is likely responsible for executing the malicious payload, potentially downloading and running further malware. The ClamAV detection 'Heuristics.PDF.ObfuscatedNameObject' further supports 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_off0000005b.js` `c9ae408f80b7fae496bd0e5291cddc27416319106999852b932a15b5b898c033`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5B	84680 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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