PDF malware analysis — malicious · 883b9a7ce188a4b1

MALICIOUS

PDF

33.5 KB

MD5: be76144c21c3a2625cb01bfdacc95d59 SHA-1: 79a749875d2f37f5bef266eaf7facb7fb29b3efc SHA-256: 883b9a7ce188a4b1f9c4afdb25153bf9dc02d227dbbee38b02a5c5955182fc33

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploits. Specifically, the 'PDF_XFA_HEAP_SPRAY' heuristic indicates the presence of heap spray exploit code within an XFA JavaScript. This technique is often used to bypass security measures and execute arbitrary code. The 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and the extracted JavaScript file 'stream_000_off00000059.js' further confirm the presence of malicious scripting. The likely intent of this script is to download and execute a second-stage payload, as is common with XFA-based PDF exploits.

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_off00000059.js` `60b81a00c9107038d5bea56c534e7f26ad4a64cdd42b20d88dd5bd8994009e43`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x59	84800 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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